i didn't think i would like the very short macbook-like keys of the new alu kb, but i messed with one for a while and found that it was actually easier to type after you get used to it.
the aesthetics are top-notch, especially when compared to the old white ones. my white kb is full of bugs and food and stains. it's gross. It also makes "crunchy" plastic creaking sounds when i pick it up, or lean into the spacebar too much. And the hard ridge around the edge leaves a mark in your hand if you use it for a couple of hours at once.
i got the wired alu kb because i wanted all of those function keys and the keypad. I use the keypad all the time. I have to make bar codes pretty often, or at least punch in isbn's and upc codes. try inputting 100 12 or 13 digit numbers with the querty number keys. not a chance.
It's also nice to be able to map the higher-level F keys to application shortcuts in CS3 and in the OS.
I also like the replacement of the "Insert" key (which stopped being useful with GUI OS'es 20 years ago!) with apple's Function key, so you can change the volume or switch tracks in itunes or whatever you want with your right hand alone, and still retain the proper use of the F keys in your apps.
it is all around my favorite Apple product in years. I do wish the cord was about 1 foot longer. It comes with an extender, but I dislike extenders.
Also, the USB ports are not powered beyond the minimum requirements to power a mouse. It can't handle providing power to a mouse and a small, single-format card reader at the same time.