The freezer trick might work, but first, just listen to the drive and is it spinning? Can you hear any clicking noises?
Steady click click click is a bad sign and typically can only be recovered by companies like DriveSavers, but as 1492 stated, it is expensive. Typically they want $500 to $600 to even look at the drive.
If not clicking can be heard, and the drive is spinning up, then it may be possible to find an identical drive and swap the circuit boards and recover the data. 320 GB drive would be around $60, so it might be a cheap thing to try. Not guaranteed it will work, but even a 1 in 10 chance of it working might be worth it to some people. However, you have to find the exact same drive to have the best chance.
