I'm seriously impressed by the new TaskBoard in the new VersionOne product. Here's a cool demo of it.
It's beginning to be a nice time for Agile teams when 3rt party commercial tool are popping up with very good offerings.
ScrumForTeamSystem.Com is the current offering for the team system crowd, but it's still far away from the usability aspects in a product like VersionOne or TargetProcess.
What Agile software do you use, if at all?