Ubuntu 10.04 (Lucid Lynx) LTS (Long Term Support) is now available. I know I may seem to be two days late with this news, but on the eve of release, a critical bug (bug #570765) was found in the final build. This resulted in the Ubuntu team having to fix the bug, re-test and rebuild the ISO images.
Anyway, the bug has been fixed and 10.04 is now ready for the masses. Go get your copy here. If you have a very slow internet connection or need to install/upgrade Ubuntu at a location that is without internet access, you can order a copy of 10.04 disc (it's free) from here.