Hum... VirtualBox runs anything from Haiku, to the BSDs, to Linux, to Solaris including Windows and OS X. It has all the same major features as VMWare and Parallels.
No it hasn't. Parallels, Fusion and VirtualBox are all quite different and have quite different features. They do have lots of similarities but are by no means 100% the same thing as you are now claiming. Also the OS support is incorrect. Compare the list of supported guest OS's from Parallels, VMware and VirtualBox. Quite a lot of differences in it. The BSD's where not supported in VirtualBox before and some still aren't. Only FreeBSD is officially supported and only because the FreeBSD development team has created a project especially for this (a very active project even).
Please provide proof for your claims.
All that's left are your claims, things I don't have an issue with, and your subjective issues with the GUI and "ease of use" which frankly I find absurd in virtualization products (they all require some kind of knowledge to use, the learning curves aren't much different. I've seen it all since VMWare was a free product back in the early 00s).
The only thing left is your false information and wrong assumptions. I personally do not dislike the GUI or the workflow in VirtualBox but I know that others do, it is the feedback I get back from users and it isn't any different than others get if I look for it on the internet or talk to other sysadmins. When people are shown something like VMware Player or Fusion they'll prefer these apps because of the more clear GUI and workflow.
I also do not have issues with VirtualBox. It runs fine for certain uses but I know it does other things not so well which goes the same for any other piece of software. Unlike you I do recognise the strengths and weaknesses of a product and I certainly am not as uberselfish as you are. Just because YOU don't have problems doesn't mean others don't and certainly doesn't mean that the product is THE product for every use. VirtualBox, Parallels and Fusion have their differences, strengths, weaknesses, etc. which defines what you should and shouldn't use them for.
Btw, I think you mean the early 90s when it was still a thesis project. In the early 00s it was a company that sold virtualisations products.
And yes, when I ask for citations, I both want and need them. Otherwise I know you're blowing smoke.
I still haven't seen any from you so by your own conclusion you are blowing smoke
Someone has never worked with a Mainframe product from IBM it seems.

IBM was doing and selling virtualization products before VMWare.
And that someone is obviously you. IBM never ever created virtualisation because of virtualisation. IBM created a system where they could run several things simultaneously. In hindsight that was actually the very first piece of software that could be marked as virtualisation. However, it is quite different from what we now know as virtualisation and what VMware sort of invented. Again, this has nothing to do with the statement whatsoever as it was about the company that actually shaped the virtualisation market, not who was the first to use it/invented it. The way the entire virtualisation market works is based off of VMware's products.
Is there much of a difference between VMWare Fusion 3 and 4? Ive already got 3 so if it isnt much of an improvement Im not sure I would bother with this.
The differences are quite big. Fusion 4 is more geared towards Lion and comes with some additional features such as vm encryption (Filevault 2 for the vm simply put) and more performance enhancements.
Though I do think Typinator is really neat, particularly since I can use it to keep all my svn addresses stored in a short cut.
Why not use a repository tool like SourceTree and the like?
I wonder if PDFPen is upgradeable to PDFPen Pro via their website?
From what I've read you get a normal PDFpen license. After installation you'll be redirected to the PDFpen webpage where they notify you that you can upgrade to Pro for 40$. Sure looks like it will but I'd ask the manufacturer just to be sure!