If you want to send a file around 100mb, then www.mediafire.com or http://mihd.net will be a good option. i know many will suggest rapidshare, but if the recipient doesnt have a premium rapidshare account, he will be in problems. if you want to send files larger than 100mb, you can split them with a splitter program, the popular one being WinRar.

Splitting large files is good choice, but if you have a slow upload connection, you have to spend a lot of time in your workstation. And there is always the chance of disconnection on either side, you or the recipient of the file.Download can also be corrupted, which will also be frustrating. for this reason, i suggest using Pando, available from www.pando.com. Or you can use torrent technology, create a private torrent, send the recipient the .torrent file and leave your PC on. Both of these p2p technogy, pando or torrent, uses error checking which ensures an error-free download.