Pivotal Tracker

We have started used Tracker from Pivotal Labs for planning and running our sprints. There are a number of tools our there that support agile development. The most common problem with these solutions is that they contain way too many features and are difficult to use due to how their interface is designed. Fortunately, we ran into Tracker and it was pretty much love at first sight. It focuses on a minimum set of features that are enough to support all basic things involved in planning and executing a sprint. The interface is really simple and effective, making is easy to plan and update stories. We have executed 2 sprints using Tracker and so far we're pretty happy, and it's refreshing to use an application that is focused on keeping the bloat at bay. Tracker is a free service right now, but that might change in the future.

Pivotal Tracker