Since I'm planning to move to the HTC Herald (aka P4350) that T-Mobile's offering as the Wing, I'm looking for a good PIM backup application -- one that can save off my text messages and call logs (contacts, etc. are already saved via my Exchange account). I found PIM Backup over at
Found this leather case on eBay using this search. Price seems good but varies from a dollar or two to about 6 and International shipping looks to add about another $6.
BatteryStatus shows the status of your PDA's battery; things like power-drain, temperature and such. And, actually, the "and such" part is pretty extensive! It comes in two versions, a Freeware and an Extended. Both are still free, as in no-cost, but you can do a lot more with the Extended version and it would appear that the author has plans to eventually charge for it. The documentation for both versions is available through that first link but it only contains a download link for the Freeware version. The extended version is available from this thread in the xda-developers forums as is an extensive discussion of it, what you can make it do, and how to go about it.
AT&T Labs has a text-to-speech page. The cool thing is, it's got different voices. Think of what you could do with ringtones? :)
Found a pretty good article here that speaks in authoritative tones about how to manage and maintain your battery.