http://statistics.graal.us/ for a ton of statistics about servers, like local/global playercount, rankings, new/removed servers, graphs of playercount over day/month/year, images for your signature to show server information, tools to get XML data about servers for your own use, and other stuff.
http://graalbin.londeroth.org if you need to paste a big script or a level for someone else to look at (allows password protection too).