Rather tempted by this atm. It would be pointless for me cause I need VS and Matlab on my laptop :(don't bother with a PPC machine if you need to use your computer for anything other than things like webdesign and wordprocessing, the latest version of OSX doesn't support the platform and soon the last version it runs will no longer be maintained so everything will be obsolete unless you want to have some fun and install PPC linux on there.
http://cgi.ebay.co.uk/Powerbook-15-1-67-G4-High-Res-No-Reserve-/270614820043?cmd=ViewItem&pt=UK_Computing_Apple_Laptops_ET&hash=item3f01e674cb