statcounter.com is listed on WS.
It's a service used for hit tracking, primarily for web stats. It also shows up in emails, sometimes in spam from main-sleaze spammers.
Having it listed means quite a lot of collateral damage though. Just do a search for statcounter.com on Google Groups and check the recent ratio of legit postings vs. NANAS reports actually involving potential abuse from statcounter.com: http://groups.google.com/groups?q=statcounter.com&scoring=d
Patrik