iPhone Apps for planning your wedding

Does anyone have a good iPhone app while planning their wedding? I keep trying to find one and I don't want to buy something that isn't going to work to what i want it to do. I'm looking for something that will keep my up to date info on the wedding and be able to plug in my vendors and give me a timetable so that I don't fall behind on anything and have up to date information.

Thanks girls! Anything would help at this point!!!!