Please don't get your hopes up... BUT >
depending on your iPod,
(if it's a nice one like a classic or beforehand)
DON'T USE IT.
buy a copy of Data Rescue, plug in your iPod and do a deep scan on it. http://www.prosofteng.com/products/data_rescue.php
you *may* get back some
I've done this with a Nano and it turned out ok, your mileage will vary. make sure your iPod can be used in disk mode OR grab some software like iPod disk.
hope this helps!