I've completed the code work for an RSS 2.0 feed add-on and it's stable for over a week now, so I thought it's time for giving back...
You can download the add-on here: rssfeed_v1.zip
The ZIP contains 3 parts:
1) RSS 2.0 feed script (PHP/DOM)
2) Bugfix for media date fields not being written
3) Integration of feed URL to theme header
...and a very small README.
Enjoy