I currently am using the CLIE TJ37/G. Its an excellent device, not too expensive but does not feel cheap either; as compared to the TH55. I think the only difference between the 2 is the availability of a mic and a variable speed processor for the TH55. The TJ37 runs on a 200Mhz processor.
Has wireless 802.11b built in and it is able to handle daily tasks like viewing powerpoint, word, adobe acrobat documents with relative ease, able to take pictures of decent quality (VGA, 640 x 480). Video player with files converted to MP4 with the provided Image convertor software does not jam or stall. (Rather smooth video playback). Able to play MP3s, comes with a memory stick pro slot, Infrared port. Screen resolution is nice too. Neat little device I should say.
One more thing, if you are thinking of using this thing to surf the net, be prepared to charge it everyday… (battery drains real quickly with wireless connection on for about 2-3 hours consecutively.)
A great buy overall. :D