I've just seen the recent Drupal.org survey, and the question "We should improve the "recent posts" page so posts can be filtered by type, category, etc:". This is something I've wanted since I first used Drupal a long time ago, but have never really got around to doing.
/tracker is the most frequently accessed page on our busiest community site, and probably on many others. On most visits to Drupal.org the only two pages I hit are /tracker and /cvs. The information on the tracker page doesn't really provide any context to the node titles it lists except for the type, so I find the experience to be quite detached and random. For example, if I visit /tracker now I see a topic called "Good start. Here's how I polished mine", and I can see that it's an issue. I have no idea what project this issue is linked to, or even what the issue is actually about. Until I view the page, it's just a random lump of content in a list. I don't know where it fits into the overall site structure.
Considering how central the tracker is to a busy Drupal site, I think it deserves some serious attention. If I want to know what's been happening since my last visit, I have to read every random issue in the list to see if it's related to a module that we use or a bug we've encountered, and the notion of sorting forum topics into categories loses all meaning when they're just presented to the use in a large list with "forum topic" as their only anchor.