iOS: If you're tired of plugging in your iPhone every time you want to import photos, CameraSync will wirelessly send all your photos to Dropbox, Amazon S3 or Flickr, so you have them on your computer when you need them.
Previously mentioned PhotoSync for Lazy was a handy way to wirelessly sync your photos, but it was Windows-only and required a separate desktop app. CameraSync (which is also one half the price) wirelessly sends all new photos to Dropbox, a service you're already using (right?) so you can access those files on your computer, no matter what platform you're running. In fact, if you prefer a different online backup program (like Amazon S3, iDisk, an FTP server, Box.net or even Flickr) you can do that too.
All you need to do is open the app — it'll send any unsynced photos in your Camera Roll right to your online service of choice. It'll even do it in the background, so you don't need to sit there and wait for the upload to complete. And, since it uses your Camera Roll, it works with the majority of third-party camera apps out there, so you can sync all your Camera+ or Instagram photos as well.
CameraSync is a $2.49 download for iOS devices running 4.0 and up.