It has been tested primarily on the PalmPilot TM and Palm III TM models. It should also work on the new Palm IIIx TM and Palm V TM models. I don't think it will work on the older Pilot 1000 and Pilot 5000 models. Development of a desktop version is still in progress.
Snapshots are available now.
ThoughtStream is Open Source Software under the GNU GPL . After a long hiatus, I intend to resume active development of ThoughtStream. See the mailing list archives for more information on what I'm doing now. If you're using 0.4.3, it'd be a good idea to upgrade. See this page for more information on the new lists.