Jake Gyllenhaal will present Oscars 2011

"Jake Gyllenhaal is joining the lists of presenters taking part in Sunday's 83rd annual Academy Awards.
The actor has become a familiar face on Oscar night, having previously appeared at the 82nd, 79th, 78th and 77th Awards. Jake Gyllenhaal, Heath Ledger and Michelle Williams attending the British Academy Film Awards (BAFTA's) on 19th February 2006

He was nominated in 2006 as best supporting actor for Brokeback Mountain, and so this year's show marks a mini-reunion of Brokeback actors because his costar Michelle Williams is nominated for best actress for Blue Valentine and Anne Hathaway is serving as co-host with James Franco.
Michelle Monaghan and Jake Gyllenhaal in "Source Code" (2011)

He most recently appeared on screen opposite Hathaway in Love and Other Drugs and will next be seen in the thriller Source Code, which Summit is releasing April 1. Source: www.hollywoodreporter.com