spoonforknife has ported the Vista BSOD simulator from the 1.1.X days onto 2.X iPhones and iPod Touchs.
Instructions: SSH this into /Applications
If it crashes upon launch (which it shouldn’t because I think I pre-signed it), install Link Identity Editor from Cydia and issue the following command
ldid -S /Applications/Vista.app/Vista
To download: CLICK ME