I’m using Mediafire for my files and the free version has a limit of 200mb per files though. So I’m not sure it would do any good for videos since those tend to be big.
I would suggest using a SVN since it’s pretty awesome when you want to work on a project with many people but you would need a Server or someone to act as one.
http://tortoisesvn.net/about.html
Other than that… Maybe one of you could download a free ftp server software but at the size of those files, you would need a pretty good upload speed if you don’t want it to take forever.