[hooliganpete]

The simpler tools definitely encourage adoption. On a larger project I work on, we use Rally - most abominable platform I've had the displeasure of using - solely because the project manager is able to assign "points" to user stories, which translate to hours of work per story. Hence, when a dev is at x number of points, s/he's at y% capacity for that sprint. We tried Jira but without being able to assign capacity, ruled it out. I've heard good things about Basecamp...