Although I switched to webOS, I do use my T|X at work still for a few reasons:
1. Ability to sync PIMs to a desktop client. My handwriting is horrid so it's nice to take notes on the factory floor and then put them in my computer. Plus, unlike the Google based stuff, it's a ton more feature rich (DateBk6 FTW).
2. DocsToGo, which still isn't implemented as well as the version in Palm OS.
But, things I still can't get outside of Palm OS:
-An email client like Chatteremail. Sure other platforms have excellent clients but Chatter still is 2nd to none.
-Thanks to the iPhone, god forbid a manufacturer includes hard button short keys. It'd be nice to be able to go to my calender with one button push rather than searching for it/tapping more than once.
-Desktop syncing (though offered to some extent with other platforms via 3rd party).
-SD card slot (thank God Android phones still have this).
-Navi buttons (again, what's with the hate of the old 5-way w/ touch combo).