The PowerMate is a really cool looking accessory for any Mac (to be honest, I think the silver one is way more Mac-like, and the limited edition black one is better suited for PC users / Darth Vader). The PowerMate looks like it should come with PowerBooks, it's that well suited.
The PowerMate feels really well constructed, and is neither tacky-looking or cheap-feeling. The blue light look great, and draws even more attention to your Mac (especially when set to pulse - a similar effect to sleep lights on Macs).
Whilst the feedback on the rotation is not 'clicky', it reminds me of the restrained/weighted feeling you get when turning the volume dial on some more expensive stereo systems.
You can set the PowerMate up so that it controls pretty much whatever you want it to - it's very customisable. It qualities are quite Apple-like -- it's simplicity belies its power.
The only drawback i can think of regards the drivers: last time i checked, there were no Panther drivers available (the Griffin Tech website says 'coming soon'). This is annoying, since I've not really had a chance to use it to its full potential as i upgraded to Panther shortly after receiving my PowerMate as a gift.
As for speakers... get the 3-piece Harman/Kardon Soundsticks: 2 adjustable satellite sticks each with 4 transducers + one subwoofer (or even better, the Soundsticks 2 which now have sound controls built into one of the satellites and also no longer take up a USB port on your PowerBook. Plus, i've read that the sound circuitry has been improved).
They'll pump out great crisp sound, and the sub adds a decent bass-line. They sound even better with iTunes EQ adjusted to your preference. I used them in halls on campus for 2 of the years i was at uni, and they managed to keep my music audible over the usual background noise / other stereos. Definitely recommended!
Both the PowerMate and Soundsticks are top-class products and really match the design & build quality of Apple's offerings. (I think the Soundsticks were created in conjunction with Apple's design team).
Both will look �ber cool next to a PowerBook
and the Soundsticks deliver the goods, especially when cranked up with a deft twist of the PowerMate