We have tried to ascertain whether it is normal or not for your type of usage. If you are constantly paging the memory, over utilizing the slower drive due to your workflow and standard usage then for your configuration it could be considered normal (acceptable? I would say no something on your system needs to change, but none the less normal).
Up to this point, you have not really shown that you are diligently addressing the questions presented to you but rather waiting for the magical answer that it is or is not normal. Have you checked your activity monitor for process usage (post screen captures if you need assistance in figuring out what is happening, or ask if you don't know how to do something)?
Just stating you use a certain program or app tells us nothing. If you are running Safari with no flash blocking and five tabs all loading heavy flash sites with active web kits on them constantly updating and allowing pop-ups then you can expect heavy system usage and I would say beach balling in your case is normal, especially if you are actively running Skype at the same time (and how do you use Skype? Video chatting, video calling, etc), yet if all you are doing is loading tabs for webpages that are static and have text only then no it is probably not normal. Reported memory usage is generally not useful as OS X memory management is different than what is expected within windows (as I stated before OS X will preload the memory so the information is there for immediate usage and free memory from inactive programs as active programs require more).
Your usage will dictate what is normal. We have no idea what an average user is, as everyones perception is different.
More memory is not a bad idea as Lion does tend to run smoother with 8, but I hate to just throw it out there without knowing what you are doing that may or may not require it? I upgraded my wife's MBP just because I had the memory laying around (when I changed jobs for my new workload I couldn't even keep up with the upgraded 8 and had to upgrade to 16 so I had an extra 8 just sitting around to put into hers), but she never saw the beach ball as her usage patterns were very basic.
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Although, I "might" agree with your expressed sentiments regarding whether it is normal or not, I ask you what is normal and how do we judge?? For Sim's usage, it may be normal to see this even though it is not normal to see it for your usage patterns. This is like stating "for the average user...", what does "the average user" even mean?
If you system is constantly being tasked, seeing the occasional pause could be considered normal (as with having 16 spaces and the heavy app usage Sim has stated is his normal workflow) as opposed to have Safari open with 3 tabs on texts sites and mail polling a pop account every 15 minutes. These workflows are both real world usages and will yield different results for both, so what is normal is dependent upon the user and workflow, and not necessarily the system.
currently i have Steam running downloading 3 games. + iTunes (no music playing)
and safari - safari has about 7 tabs, inc this forum, amazon, some other static pages,
a youtube page with the video not playing.
and my first sign of beach ball:
i activated mission control this morning to begin using the computer the way i do on average,
after adding 2 desktops so i would have 3, i licked on the 2nd one to personalise it and change
its desktop background. as soon as i right clicked and clicked change background, it beach balled for about 5 seconds. it didn't even jump straight to the desktop & screensaver option,
it started on system preferences, lagged and eventually loaded desktop & screensaver option.
at this time, "free memory" reports me having between 18mb-20 mb free memory.
here are screen shots of current state.
okay, so i have got my system running now with:
Mail - several accounts.
Safari - about 12 tabs, i opened: Facebook, deviant art, amazon, a blog site, BBC iPlayer..
iTunes - playing a song
App Store - just open.
Steam - "validating" and installed game
Dashboard is always running.
=
i have 3 desktops open, sometimes i have 5, so i will make it 5.
iTunes and safari are running fall screen.
wen i use launchpad, it is typically smooth still but the icons are lagging behind in loading. they don't just appear.
mission control remains mostly smooth, but swiping desktops by desktops is a little laggy sometimes.
i have now opened iMovie, which is working with 1080p HD content from my canon 60D, though its not full length movie files or anything.
i haven't experience a beach ball so far since the desktop background change, which is good, what i expect, but this performance isn't consistent. steam is usually prone to beach ball, and i will get
laggy response sometimes with the dock/launchpad/mission control.
with this kind of usage, how much beach balling do you think i should
experience a month/daily?
i just received my screw driver kit for the MBP this morning, i now am ready to install 8 gb of ram, and last night i decided to back up my windows HDD on the acer (its a early 2011 momentus xt 500gb HDD) so i am ready to also install that moments xt. i think its on SD25 or SD26.
i am intending to buy a new HDD (not sure which yet.. SSD for fast app opening and booting, or a fast HDD like the caviar black for actual fast performance in read/write/transfer)
but i was thinking last night to try out the MBP with the Hybrid drive (moments xt that i have got) plus the 8gb ram to see how it runs, see if its a problem with the software or just my usage. should i give it ago?
i think the only way i can install lion onto it is to put the hybrid drive in the macbook pro and put the mbp hdd into an external enclosure and boot into lion recovery?
thanks to all your replies, again all of you, i will see how lion runs with 8GB ram either today or within a week when i buy a new HDD.
im not sure about HYBRID route or traditional HDD route.. i can't go SSD because they are way too pricey for me after the 128GB size price point. i;d need 500 GB and thats way to expensive, the reliability reports in the amazon reviews on that crucial m4 doesn't give me confidence either.
thought it would be note worthy to say that while uploading the image links on tiny pic, iTunes music started to lag/cut out a bit.
edit**
i forgot to run Skype, i sometimes May run mac messenger and or dropbox. so will get one last screen shot with these, it beach balled when i opened these 3, it went back to desktop one because mac messenger has only just been installed not done the agreement/sign in yet, when it went to desktop one to do the agreement, it beach balled.
by the way, my Skype use is 50/50 between text chat and actual calls.
also to note;
i had text edit running to type this out in and document all this while i was doing it..
activity monitor obviously.
EDIT** screen capture inc. ALL processes.