Last summer, I made a little companion website for 50/90: http://niftyfinety.com/
Nothing too fancy. It really has just two features:
* Organizes all Skirmishes into a calendar view.
* Pulls all downloadable demos into a podcast.
I found these handy last year, and I was happy to see that everything still seems to be functioning correctly this year. If either of these features sounds handy to you, enjoy!