An little FTP serever would work well. If your bro could host the server, then all he would need to do is set up FTP server software like Serv-U, and then let you know when he uploaded something (and leave his PC on so you can get at it!).
Another option I have never tried is a little app that lets you share files without an actual FTP server. it's called Basic File Transfer Utility and it's available
here. I've never used it, but it looks like it could work fine.
Cheers
Mick