What does this feature do? This feature introduces more data graphs, such as Open vs Resolved charts, 30-day issue summary. I also think it would be helpful to include some new views: such as Issue view: showing unresolved by priority/assignee/version. Maybe a changelog to show what issues/tickets have been resolved by each version - with links to the tickets (feature update, having seen current implementation)?
Maybe easier for you to use Google Chart Tools: http://code.google.com/intl/en-US/apis/chart/ or some other jQuery think (jQuery Visualise plugin?)
What makes this feature interesting? They are pretty useful metrics for a team, and for product managers.
Hint. I'd like to make Traq a really appealing alternative to Atlassian's Jira.
I've added some basic charts to the project and milestone info pages.
You are welcome to fork "Traq on GitHub":http://github.com/xocide/traq and expand on them then send a pull request or patch which I will integrate into the main repository.