In addition to the ones Courtney just put up - only one I can think of rightaway is
www.gumtree.comobviously house sharing has it's own set of 'issues' and so long as your fine with the positives and negatives, it'd make a good way of 'starting' off here in London.
You may wanna check the agents around Heathrow, I spoke to a nice middle aged lady who does alot of Heathrow airport rentals for the flight attendant girlies, and I remember her saying she likes to put all girls into a houseshare.
I wish I could afford more properties to rent! I'd have all you 'popping over here Americans' nicely looked after ! im a 'nice' landlord!!!!
Dennis! West London UK!!