From their front page:

Nov 12, 2008 Project will soon close down
Due to a lack of time and resources, we have to close down 3x+1@home soon. On Friday, 14th November, we'll stop generating new work units but results can still be returned for a long time. Of course the project page will stay on-line for everyone to view or download (available soon) the project results. Thanks to everyone who has participated in this project!

What a Shame I was just begining to enjoy it