www.londonofficejobs.co.uk
www.reed.co.uk
www.loot.com for cheap rentals (well cheap for london....)
I've just agreed to rent a 2bed flat in NW london, Zone 3- over £1000 a month, my girly has paid between 200 and 450 a month for single rooms in various parts of London. The east is the cheapest area, followed by the south east.