Android have been suffering from an unknown security problem, where users who log in to different services on unknown networks could get their personal information stolen by hackers! But Google have now come up with a solution to all this, and is releasing a global update that will, hopefully, eliminate the security problems.
It's in particular three applications that have been triggering these problems; Google Contacts, Google Calendar and the image service called Picasa. This update that Google is supposed to release is calculated to reach all Android users within a week, and it fixes the problems in the apps Google Calendar and Google Contacts. Picasa is still however still risky, because of technical reasons. They are working on the fix for it though.
Note: This update does not require you to do anything, it will be done automatically!
I think this is cool, even though I don't really use Android :)