Videospin
Pinnacle Studios has received a handful of criticism for limited functionality of its software, but things seem to have changed with VideoSpin. VideoSpin is a free video-editing software that offers plenty of options for beginner editors. This video-editor performs really well in comparison to its other free counterparts, making this a perfect choice for casual use.
This obviously is no match to the full-paid editors, but does a decently good job by providing options like transitions, various codec supports, output of clips for Video networking sites such as Youtube, Metacafe, just to name a few.