The scrolling trackpad is awesome for me. I'm so used to it that I always find myself trying to scroll on other people's laptops. The one thing I did to though was to turn off horizontal scrolling. It didn't work too well with both horizontal and vertical scrolling on (at least not for me).
Wireless shouldn't be a problem at all. 802.11g is a standard. Apple just calls it Airport Extreme.
I don't know what to tell you about the keyboard thing. I guess you could get a Bluetooth or USB keyboard for when you are at home. Those are easier to clean and will keep your Powerbook keyboard clean. I don't have a greasiness problem and I use that pressurized air stuff to clean it occassionally.
My only complaint about my Powerbook is that it gets pretty hot but that's minor.
Good luck with your decision. I hope this helps.
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