SplashPhoto features easy sync with the desktop companion, and integration with Flickr and Picasa for photo sharing. SplashNotes sync with the desktop is even better because it's easy to take notes on a laptop and then take them with you on your iPhone -- or vice versa.
Check out their complete -- and extensive -- lineup of apps at SplashData.com, including one of their favorites, Birthdays:
It tells you how many days are left before your friends' birthdays. It automatically pulls in birthdays from your contacts.
If you've tried any yourself, drop a us a comment below and let us know how it worked for you!