I am happy to announce...
A very few people have requested a ranking with active sites only.
I worked on this a bit, it's not perfect, but now available.
I am sure you will find the new tab in the ranking pages.
Also i have created a new challenge called BritCoin
It is merely a programming training, but should be fine as a new chall here.
It might be broken so please leave me a note when you get problems.