Peer2Mail. Got a web mail account? With lots of space? Then you might like this free little application which lets you use the spare space to store your files. Apparently works with them all, Yahoo!, Gmail, etc. Not sure about Hotmail though. Still, definitely worth a look-see.
P2M splits the file you want to share/store zips and encrypts it. P2M then sends the file segments one by one to your account. Once P2M uploaded all file segments, you can download them and use P2M to merge the segments back to the original file.