TigerGammon has left the beta phase and is now productive. There are no more known bugs. Just go there and enjoy.
New features will be developed for TigerGammon. So having NackGammon and HyperGammon available, already, there will be a HTML5 client, time control and more, pretty soon.http://tigergammon.com
has had a relaunch. It is available in English and German. Other languages are possible; if you want to help with translations, talk to andreas (at) tigergammon.com. There will be new content in upcoming weeks. So you might want to check every once in a while. Or you just follow http://twitter.com/tigergammon
to get informed about new content.
Presently a TourneyBot is being tested to give support for tournaments. There is another thread
Enjoy playing backgammon on TigerGammon!