The new Chuck E Cheese fundraiser is great! Check their website for information. You are allowed 1 a month. We also use The Home And Garden Party Candle Sale. It makes us the most money by far. It is also very simple.
My PTO a Jog-a-Thon in October and we net on average 10K. It takes maybe 5 people to organize and parents can visit/volunteer during the gym class and help out when the students Jog. Time involve would be include copying the flyers & collection envelopes, collecting/counting the money and the actual jogging time.
Our school does not "encourage" ctalog fundraisers, so we have to think up others.