One of the more interesting features of Fisheye is Linecount statistics.

You can tell by folder or by repository how the Linecount has grown or shrunk with time.

It would be very useful to determine other metrics or statistics and how they change over time.

These metrics could be predefined, such as linecount, filecount (in directories), filesize, wordcount, code density etc.
Or they could be extended via plugins eg. Cyclomatic Complexity, checkstyle violations, etc.

This kind of info would be really useful to help judge where to pinpoint coding effort or to determine where to focus Q/A resources.