http://thewhir.com/features/subdomain.cfm

In astonished postings to Web hosting discussion forums last week, several hosting providers announced that they had received letters from a party representing Stateline, Nevada-based Ideaflood Inc. (ideaflood.com). The letter stated that Ideaflood has patented the idea of assigning users subdomains, such as AutomotiveWidgets.hostingcompany.com.

So I will get sued as well.

-Stefan