I have just done some testing with the newly released version of OmegaT. It's 2.18 Beta. The main difference is a function called "aggregate tags" which basically reduces the number of tags on the documents by a huge amount. If you've used OmegaT in the past you may have noticed how annoying all the tags were, especially when they cause all kinds of strange problems with matching the TM. This new feature really helps a lot with that function.
I downloaded the new version from http://sourceforge.net/projects/omegat/ and don't forget you can leave a donation to the designers if you wish. For me the tags were a really serious annoyance so now I can think seriously about using OmegaT again.
The new release came out on the 29th of July and is still in Beta, so the default download on source forge won't get it, you have to click to see the full list of versions and get it from there. You can always check www.omegaT.com for more information.