The only reason I mentioned it is, that Limewire will be supporting BitTorrent as well as the gnutella network. You can read here what torrents are:

http://en.wikipedia.org/wiki/BitTorrent

It's the most effective P2P network for large files. When making a torrent you add entire folders.

Let's say you have a non-copyright DVD, that you made yourself:

If using the gnutella network you could never share it effectively, because you only share single files. Also there is a 2GB limit on files, so you could not put a 1+ hour DVD in a .zip or .rar archive and share that.

If you made a torrent, you would add the entire folder containing all the files no problem