the prime days of this site are over, unfortunately. I have made a little graph to confirm this:
The graph shows the number of active (e.g. solved at least one challenge) users in a 28-day window (scrappend from the solvers.php pages), the first solved challenge was on mar 28, 2008. You can see a peak in august 2008, when this page was features http://heise.de/-291780
Another smaller peak in october 2010 - and then its just a decline...
graph: https://img.onl/SHrORD
raw data: https://gist.github.com/Entkenntnis/1b0 ... 083294abf0