I like 2 programs for their simplicity and ability.
Cyberlink PowerDirector is what I use for quicky jobs even though it has a lot of built in features. You can even download a trail version at cyberlink.com
I also use Pinnacle Studio for more intensive editing. Still easy to use though. They just came out with version 11 that is much more stable than earlier versions and even comes with a green screen in the box! Lots of plug ins available too (for a price).
other than picture package and windows movie maker?