The Speed Gamers are a well known group of people who host live video game speedruns for 3 days (or sometimes a whole week) along with their commentary for charity. The Speed Gamers have been on the news countless times (as seen in this link  http://www.youtube.com/watch?v=gN4rm0Dj8wM ) and are therefore trusted by many, and for the right reasons. They always keep their promise in giving the money to charity and provide great commentary for their fans, sometimes even doing things in the game or giving away prizes depending on the person who donates the most.
Check out Their latest Marathon at 
http://www.thespeedgamers.com/
 
....Okay so actually this is a really poorly written blog but seriously, if you could at least continue to promote The Speed Gamers then it would be very useful for their cause.