Apple recently released iOS4 and  a brand new updated  TOS (Terms of service). I believe it was like 46 pages long! Apple decided to give your Geo data to Apples advertisers.  What does this mean? Well, It means that based on your activity on the iOS4 you will get targeted ads. Luckily, apple lets you opt out. If you are on iOS4 and go to http://oo.apple.com. Here you will be able to opt out.