Ubuntu 8.10 Intrepid Ibex came out today. Help reduce demands on the main server by downloading your version over BitTorrent. Here are links to the torrents for the various versions. If you're not sure which one to use, you probably want the first one.
At the time of this posting the torrents are not yet seeded, but go ahead and get it loaded into your torrent client and it should get going once the official seeding starts.
Torrent Freak has also posted a way to update your existing system through BitTorrent if you're feeling more adventurous.