For an OS X machine, dependent on your actual requirements, I would suggest either an iBook or wait for Apple to revise the 15inch Powerbook in line with the 17inch.
The 12inch Powerbook doesn't seem to offer much over the 12inch iBook, except a G4 processor and more heat generation.
I can heartedly reccommend the Toshiba Portege 3500 Tablet PC. Would have reccommended the HP Omnibook XE4100 but HP aren't making laptops anymore (though if you want one cheap I have a spare one at the moment, 256MB RAM, DVD, etc., boxed as new). Client of mine has switched to the Compaq Evo N1015v as a replacement. First one in does look lovely.
Re: laptop?
The 12inch Powerbook doesn't seem to offer much over the 12inch iBook, except a G4 processor and more heat generation.
I can heartedly reccommend the Toshiba Portege 3500 Tablet PC. Would have reccommended the HP Omnibook XE4100 but HP aren't making laptops anymore (though if you want one cheap I have a spare one at the moment, 256MB RAM, DVD, etc., boxed as new). Client of mine has switched to the Compaq Evo N1015v as a replacement. First one in does look lovely.