I activated my own special event call, Mo0BGR with a short session on CW (Morse) last night. Conditions were not great, but the first station I worked was UX5MZ - thanks Igor.
Meanwhile over in Eltham, SE London not far from the Olympic venues, the Cray Valley special event 2o12L is going great guns, having worked over 5,000 contacts and 100 countries since Wednesday. For more details go to www.2o12l.com where you can find a list their working frequencies.
If you are in London, before 9th September, then try to go along and visit 2o12L, how to get there is also on the web site and it is a really impressive station.