For those who are not familiar, this runs for 4-5 days each summer in Hyde Park. The days tend to be themed (IE Fri = Alternative, Sat = dance acts and Sun = Music for accountants.
First acts announced for the Saturday (5th July) are Fatboy Slim, Underworld and Bootsy Collins.
I must admit, the only reason i go to this every year is the rather convenent location (and the fact they serve Tuborg in the beer tents). The overall lineup tends to be so-so.