I'd also like to recommend Grid. It might have a lot of other features too, but it is very handy for decursing.
Here's a link for the TBC version of Grid. If you want to use it on the test realms, you'll have to modify a couple of files though, because of the strange version numbers from Blizzard.
http://www.wowinterface.com/download...fo.php?id=5772