There are fake apps being produced for exploiting Android. The majority are directed towards the Android Phones. But, there is no reason the same app could not exploit your Tablet. The most recent is the TweetDeck app. The common mechanism is to do SMS or similar messaging to paid sites. This results in charges for the individual. With Tablets holding 3G or 3.5G modems, this is the risk. The risk is potentially low right now for those who have Android with only WLAN wifi capability. But it would not be difficult to do other nastiness. This is just a heads up. Choose a trustworthy source if you are downloading from other sources than Market. More Android units were sold last quarter than IPhones (See Link). As tablets become more popular and have integrated 3G Modems, they will face the same risk as the exploits as I just described.