If you need a handy video to help that pesky creationist friend of yours to understand evolution, you cannot possibly find any better than this video by Dr. Jerry Coyne:
http://vimeo.com/41921435
The important stuff starts about 21 minutes into the talk, so feel free to skip ahead (that way, you can learn all about evolution in under 1 hour!). The book that the talk is based on (Why Evolution is True) is also highly recommended.
The talk goes into a lot of things that are often overlooked in the creation/evolution debate, like how frogs are mysteriously absent from oceanic islands and how evolution explains it.
