Chores

I've been thinking that I need to start a system with chores around here lately. My kids know how to clean up their toys and help around the house (Will even occasionally helps me vaccum- he likes to vacuum with the hose) BUT I'd like to do something consistent that involves making every day chores fun.
I've heard some good ideas from some of my friends, but I just wanted to put this out there b/c I know a lot of you do some really creative things to help the kids get involved.
So, any suggestions?