I own a Digital Agency based in Norwich, UK that specialises in Conversion Rate Optimisation. This means, making websites easier for people to use, and ultimately - turning more visitors into customers.
***Update 01/08/11 ***
AdditiveCRO has been acquired (yippee!!) by the Foolproof Group (www.foolproof.co.uk) - the largest dedicated User Experience agency in Europe!
Guess that means they've acquired me too...