If you’re one of the ones who uses both (gasp!) IE and Firefox, here’s an article for you:
Sync Bookmarks Between IE and Firefox
Also check the comments — some comments and other solutions are there.
Also, through my own research, I discovered Zinkmo, which claims to sync it between Firefox, IE, and different computers.
I never use IE though, so I haven’t tested it. As I say, use at own risk.
