XQ.biz
The title says it all. There are only 676 total possible 2 letter combination's. Obviously, all are taken and have been for a while now. If you would like verification that I own the domain please feel free to email the address on the whois details, I can confirm your email.
Registered at DynaDot
expires in 2011
Original reg. fee for this LL.biz was $250
Over 23mil Google results for "xq"
XQ could stand for:
Xtreme Quality
XQ instead of IQ (Could be something like an IQ test but for XXX stuff)
Not looking to get rich off this but am looking for some reasonable offers in the XXX range.