Which project tracking tool do you use?
Does it allow programmers to bill hours worked to projects/tasks?
Does it allow to track items promised vs. items delivered?
Does it allow to forecast personnel needs when you have only a ballpark estimate of how many hours you are going to need for different task types?
Does it integrate with your bug tracker? [Mantis]
Does it integrate with your source control tool? [Subversion]
Does it allow you to easily publish your schedule and current priorities to team members?
Does it produce reports on any or all of the above?

Am I even right in calling a tool that does those things a "Project tracking/management tool"?

What does your tool have that makes you love it and use it every day?

I don't really care about Gantt charts. I find Microsoft Project quite clunky for this needs (although I'm hardly an expert user).