Freezer is what I have always done and it often works. Don't leave it in too long, just bring it down to the lowest temperature (probably 30 minutes in a good freezer) then pull it out and get right to work. Make sure you can move files fast because usually you can only get away with freezing it once. After that its gonna be toast (more often than not).
Like I said, I have done the freezer trick before and saved a lot of files before total oblivion... just remember once you power up you have a very small window of opportunity - hence use it wisely