If you use an Android-powered smartphone or tablet, you might want to read this article. Apparently a publisher installed some malicious code into some already-approved apps and when people updated their apps, the code started rooting through their phones pulling information and even listening for credit card numbers, etc.
According to the article, Google - which runs the Android Market - has already pulled the offending apps and banned the publisher. But, the code is still out there, so if you have any of the apps listed on this site, uninstall them ASAP.