I am not a SNL fan so that will be my excuse for not knowing the host of the 2009 MTV Movie Awards. The MTV commercials that show Andy Samberg as the host really don't give a good indication of what has made him so popular. I looked him up on Wikipedia and realized that I big fan of his collaboration with pop music stars.
Jizz in My Pants
I'm On a Boat (ft. T-Pain)
Dick in a Box (ft. Justin Timberlake)
Mother Lover (ft. Justin Timberlake)
In Feb of 2009 he released a CD with his group the Lonely Island with the name Incredibad.
Don't forget MTV Movie Awards May 31.