Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An excellent Linux PDA

The iPaq series has been a fine platform for those looking for a nice PDA. The expansion sleeve approach taken by Compaq (now HP) makes it possible to carry the add-ons you want and ignore them when you don't. Techno-types who want more than an overblown PIM with MP3-playback will appreciate the ease with which Linux moves onto the iPaq -- alas, the SD slot can only be operated with slow MMC cards due to nondisclosure licensing terms (security through obscurity rides again...or still). Linux on PDAs is advancing as rapidly as its PC version has done and if you've thought about playing with it, the iPaq's a great machine. (Oh, and you can also restore PocketPC if Linux is not for you.)