I'd like to know what this forum thinks is the best free case available through the case program, and which protective skin (Invisible Shield, etc.) is the best overall. I got my iPhone 4 a few days ago, and while I don't think I'll actually use the case, I'm still going to take advantage of the free case program. I definitely want a skin on the front and back, though. I had an Invisible Shield on my 3G and was generally pleased with it, but is it the best one? If I do end up using the case, I'd like the one that adds the least bulk to the phone but is still protective (and stylish). I've seen the bumper, but I don't really like how it puts the ring/silent switch in a little divot. Please note that I am only looking for opinions on the available FREE cases.