You'd think that all these communications tools that ask you to move your files online make it easy to move big files too. I've recently had to send an archive that had around 100 MB to a group of people. If I wanted to send the file to a single person, an instant messenger like Google Talk or Yahoo Messenger would've been a good option. I initially thought that BitTorrent is a good idea, but that works well for a big group that connects at the same time (though Pando is a nice client based on BitTorrent).