Hey, I'm definitely in one of those "Snape survived" camps. :) I attribute it to the rule of X-Files: no body, no death. And while they mentioned his body in one sentence, no one bothered to check a pulse, etc.

I'd like to think Severus survived by some might of willpower/Fawkes/Lily's intervention, and either was rescued later that day when Harry insisted they go get his body for a proper burial or decided to say 'screw this' and left on his own to never return again.

*shrug* At least there's enough of a loophole we could believe this! Think of the poor Dumbledore fan girls! (Do those exsist, btw? :P )