erased file retrieval

There's not much out there.. here's one:

http://www.prosofteng.com/products/data_rescue_info.php

And its a pain to use. but i guess they all are, most of them charge by how much mb you recover and so unless it is a very important file you erased it is not worth trying to recover. Might try searching Macupdate (http://www.macupdate.com/) for "file recovery" If you read the reviws you will get an Idea how they work