Hi! If you still don't use Dropbox, it's time to start. As of now you can get up to 32GB of free space (the referral space just doubled to 500MB). You can use it on your iOS, Android, BlackBerry to automatically upload pictures to your Dropbox and quickly share them with others.
Dropbox integrates into Facebook and Twitter so you can share your files with your friends and coworkers. You can share your files with anybody, not only Dropbox users!
My favorite feature is the way Dropbox handles my files. Similar to OSX Lion, Dropbox saves versions of your files. So even when you change it in your Dropbox, or accidentally delete it, you can still restore it to the last know version. This functionality doesn't require OSX Lion!