Kirk emailed me asking if I knew of any IPod sized samplers. The smallest hardware sampler that came to mind was the Yamaha SU10. I then remembered there was Griff for the Pocket PC and possibly others. I did a quick search for Kirk and found Z4 Music and Griff. There is also my favorite Sequencing software, MiniMusic for the Palm with SynthPad. Finally there's the M-Audio MicroTrack and the Edirol R-1 and R-09, but I beleive they are more straight audio recording devices rather than samplers. I figured I'd put up a post for others as well. If you know of any other IPod sized samplers, feel free to comment.
Update: A couple more:
Via the comments: The Roland MS-1
Via Kirk: The Boss SP-202.
Update via David Kristian in the comments:
"Chocopoolp also makes some decent Palm OS apps, including Bhajis Loops, which combines sampling, sequencing and effects. http://www.chocopoolp.com/"