Neverwinter, a free-to-play MMO from Perfect World (Star Trek Online, Champions Online) is releasing their Open Beta on April 30th. If you purchase a Founders Pack, you'll get early access, and a whole bunch of other goodies.
I had some time in Neverwinter in a closed beta weekend a few weeks back, and I really enjoyed it. The combat is quick and responsive, and the overall feel of the game is really solid. The coolest feature, though, has to be the Foundry, a feature that allows players to create their own dungeons and storylines, much like the modules in Neverwinter Nights from way-back-when.
Be sure to download the client, and start playing as soon as the game goes live!