ZDnet reported about a sort of successful Linux Trojan. It looks like a real threat, even Engadget mentioned it. It's not a trojan that needs you to go into immediate lock-down; before it works you will need to click a link so a malicious website can do its job, but still the Linux Desktop must be gaining popularity when someone goes through the trouble to actually do this.
As ZDNet reports:
This appears to be a variation on a very common theme in contemporary Windows malware: A banking Trojan.
Here the name of the game is to grab your personal login and password data with a "Form grabber" as you enter it into your bank or other online system. This information consists of your stolen credentials, the timestamp of when you visited a site, which Web sites you visited, and possibly your Web browser's cookies. Finally, all this is then passed on over the Internet to a command-and control server. From there the crooks can get to work selling your information to people who will start running up your credit-card bills.
So take care, people. This is real. Only click links that you can verify. Go to your banking system through your bookmarks and you should be safe.