GitHub adds a dashboard showing all issues for all your projects
github.com
github.com
on a related note, my team is working on http://inboxissues.com/ - a browser extension that bridges customer support emails with issues in github. it helps you easily triage issues without leaving your inbox. and once a bug fix or feature gets committed, you can effortlessly notify customers who were waiting on that feature.
I've previously opened issues as a test, assuming I'd be able to remove them afterwards. They're now permanently attached to my repository.