I'd love to use Dropbox to back up all my photos and videos, especially from iPhoto. But I'm not exactly sure the best way to do this is, given that I know that my 2 computers with iPhoto directories will conflict with each other within dropbox. And my video collection (with 2 little kids) is getting massive. 100 GB from Dropbox won't cut it.
I understand flickr is a good option, in that they integrate directly from iPhoto and have unlimited uploads (how is this possible for only $25/year?). Can they also automatically synchronize photo/video folders?