Android: when the debug certificate expires

Today morning, big surprise! Trying to build my Android application I get this error:

"Debug Certificate expired on....."
What a f..k? And now? What I'm supposed to do?

No worries....going to the default storage location for AVDs which is in 

- ~/.android/avd on OS X and Linux, 
- in C:Documents and Settings\.android on Windows XP, 
- in C:Users\.android on Windows Vista 

you can delete the file debug.keystore and the next build of the projects will generate again a new valid 
debug certificate