Here is an interesting bit I found over at Hack a Day. Due to a new security vulnerability in Windows Vista, Windows Server 2008, and Windows 7 is it possible to crash some systems and run offending code. Android developer Sinisterware took the exploit and ported it to Android so users could hack test Windows machines.
We have yet to see any widespread Android viruses, but we know it has its own security holes. It would be really interesting to see a cell phone virus that attacked desktop computers. Hopefully Android will remain under the radar awhile longer before anyone takes the time and effort to create a malicious app.