I have been plagued for years with the problem of sending and receiving big files to people, and have often been left to struggle with the very user unfriendly FTP system — something which I still don't quite understand how to use.  Just a few weeks ago, I found out about a service called YouSendIt, which enables you to send quite large files (up to 100MB) for free. I think they charge you for bigger files and some premium services, but the free service isn't buried, it is the most prominent thing on their landing page and it is absurdly easy to use.  Note that I have no financial interest in YouSendIt and have no idea who works there or who owns it. I just think it works great, and if you are ever in that frustrating situation where you can't send or get a big file, this is the answer.