People tend to go directly to Ubuntu.com, Kubuntu.org, Xubuntu.com and Edubuntu.org to grab the latest downloads. That is fine, but for a day like today, being the Feisty release, you are going to be either downloading forever, or constantly losing connection.
So here is what I would do if I were you. Go to another distros website (i.e. Fedora, openSUSE, Gentoo, Debian…) and go to their download section. They tend to have a list of mirrors somewhere in there. Find a mirror closer to your location. If the mirror has any of the distros listed, then there will be Ubuntu a directory or two up. Most universities maintain Linux mirrors to the main distributions. For instance on one of my local mirrors here in Chicago, I downloaded all of the ISOs available for final release in less than one hour. 2MB/s to be exact. Now, once you have downloaded those ISOs, be a pal and seed them with your favorite torrent application. Remember to throttle your bandwidth a little bit though if you plan on seeding multiple ISOs.
Other than that, HAPPY RELEASE DAY EVERYONE!