Speaking of the Treo 650, couple of software apps I've gotten for
mine that prove to be quite useful:
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mVoice - voice recorder software. Saves direct to your SD card in WAV
format, easy to manipulate and use voice notes with it.
AcidImage - JPEG viewer software. Zoom, rotate, slide shows, etc. FAR
far better than the built in picture viewer software. Can handle a 6M
or 10M JPEG file very very quickly. (No RAW support, though.)
SnapperMail - better email client than the supplied VersaMail.
FileZ - simple file browser utility to see and manipulate explicitly
what you have stored on the Treo.
Foto Timer - interesting timing application with audio assistance.
You can set it to run for 30 seconds with a two second beep, etc.
Useful if you're making long exposure timings, processing film, etc.
Missing Sync on Mac OS X is FAR FAR better than the Palm Desktop
software. Use it with the iSync conduit and all your iCal
appointments and To Dos, your Address Book contacts are integrated
and synchronized. Memos you write are saved in Missing Sync's Memo
Pad, and can be output to text files very easily.
Also found a small adapter that allow you to plug in a 3.5mm stereo
mini-jack to the Treo's 2.5mm stereo mini-jack audio port. The one
from PalmOne is large and awkward to use.
Godfrey