It always feels particularly satisfying when a client gets off the ground. Jonathan Shrago, winner of a trip to New York and San Francisco from the SeedCamp where I coached presentations, has set up his site.
For those in London, Advertag are focusing their site first on jobs in the Harrogate area for feedback on SEO (and those looking for jobs).
Their work is wonderful, and they are a very smart team. Keep your eye out for their blog.