I found a really neat app called AppMiner and what it does is they find all the apps that are on sale but they also update when apps go on those limited time free downloads. I guess when a developer doesn't have many comments and wants to showcase their app they put it up for free for a bit. I've found a few games this way. Some i have kept and a lot I have not but way better than spending 99 cents for it. And yes its free. Interface is simple and all I do is use the sale tab choose ALL then hit the free tab every day. Now and then I see whats actually on sale but I just hate to get something I'm not going to like and can't return it.
Yah i just looked into it and they were saying there were server problems. Someone mentioned app sniper but thats a buck and defeats the purpose for a penny pinching freebie looking snob. LOL. Bargain Bin is one i saw too but the reviews are still kinda low.