Reporting and Charting Kitchen

Bugzilla allows you to view and track the state of the bug database in all manner of exciting ways.

Current State

Search - list sets of bugs.
Tabular reports - tables of bug counts in 1, 2 or 3 dimensions, as HTML or CSV.
Graphical reports - line graphs, bar and pie charts.
Duplicates - list of most frequently reported bugs.

Change Over Time

Old Charts - plot the status and/or resolution of bugs against time, for each product in your database.
New Charts - plot any arbitrary search against time. Far more powerful.