My son was playing on the phone the other day and downloaded a lot of applications. He is only 6 and somehow knew to use the market to download new games. I am worried because it is so easy to buy apps without a password or anything. Plus I would like to be able to control what he can play. Ideally I would like a pin or password to protect the market and perhaps other applications on the phone as well. I am kinda shocked something like this is not built into Android. Can someone recommend the best application locking tool? Thanks.