What do I do with my old Powerbook

Right, it's that time of the year, when I get avaricious - the old "need for greed". I have an old Powerbook (which I love, though it's slowing down these days) and I lust for the new MacBook Pro. It's fast, looks good, is thin, and has a magnetic powercord. What more could a geek turned management consultant ask for? Now what do I do..? I can't just abandon my Powerbook. It's my best friend (and business partner) Any comments would be much appreciated.. (apart from the obvious :-) )