Tungsten T3
I have a Tungsten T3, it is better than the T2 (which a work collegue has) but doesn't have WiFi (Airport). Pa1mOne is meant to be releasing a WiFi SD card later this year. Also they are releasing a new handheld (T4?) later this year which (according to rumours) will either have WiFi built in or dual SD slots - on which will be SDIO compliant (fur card such as WiFi, etc) and one stndar one which can only SD or MMC memory cards. So it may be worth waiting (seems like a lot of on this form does that for various things

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As for the difference between the T2 and T3 they are as follows:
Memory: T2 has 32MB; T3 has 64MB
Screen: T2 has a 320x320 screen with dedicated grafiti area; T3 has a 320x480 with a "virtual" grafitti area (area hidden by slider on both models)
T3 also has a slightly newer OS and a dedicated "button" bar that allows quick access to alrams, bluetooth, battery levels, hid/unhide the virtual grafitti area and (nearly forgot this) a button to turn landscape mode on/off.
Fianlly T3 has a
slightly poorer battery life than the T3 (thanks to the screen), however I have never had a problem with this - I charge it at work and at home when its not in use.
Both have bluetooth
There may be some other minor differences, but I cannot remember them at the moment. However if you can get a good deal on the T2 then it is still a good Palm handheld.
I have not yet tested my T3 with a Mac yet (its on order though) so I can not comment on how well its synchronizes yet. It does come with a Mac version of Palm Desktop and can also sych with Ical/Address book, Palm Desktop and Office Vx and Office 2004. However this is the last Palm that will come with Mac software in the box so products like missing sync will be essential with the new Tunsten Tx?
Finally, I have used Pocket PC's and have never been impressed with them, always seem a bit slow, a bir crash prone and are also more likely to duplicate data. They also need 3rd party software to synchronize with Macs. But lots of new models are just coming out that are faster and most (including current) models have WiFi and bluetooth.
Hopefully someone who has a PocketPC can give feedback on their experiences.
One question for Montserrat, how does Missing Sync deal with categories?