Check out this great review about CloudUp. I've been using CloudUp since they launched and have been loving it. It's an extremely convenient and fast way to share pretty much anything you can drag into it. I primarily use it to share photos and video from shoots with clients as well as for creating mood boards. I also use it for sharing audio files for music projects with my band. Anyway, I HIGHLY recommend it as a great alternative to DropBox, YouSendIt, etc . . .