What's a burn down chart, you ask? A burn down chart is a graphical representation of work left to do versus time. Burn down charts are useful for seeing how much work has been completed and how much remains. They can even be used to help predict when work on a project will be completed.
How do they work? A burn down chart is dynamically generated for every tag. Go to your tracker's Tags page, click a tag, then click "View burn down chart" at the top of the page. Some tags will have more interesting charts than others. To get the most out of this feature, I recommend that you tag groups of bugs with a unique tag that represents a complete deliverable or milestone. For example, if there are a set of bugs you know must be finished before you can ship version 2 of your product, then you could add a version2 tag to each of those bugs. The burn down chart for version2 will then give you an accurate picture of how much work is left before you can ship.
Take a look at the pretty screen shot above. This is the burn down chart for fictional project milestone1. There were 26 open bugs on April 23. Four bugs were closed on April 26 and 8 bugs were closed on April 27. Progress continued until May 3rd when the last 2 bugs were closed and work on milestone1 was completed.
I hope you like this new feature. As always, your suggestions are welcome.