Does anyone have any recommendations for the best file undelete
software?

For example, for when I empty the recycle bin with a file that I
didn't want to delete.

What I want is something that I can have on computer for when I do
something really stupid.

The software has to support

* Windows 2000
* Windows XP
* Windows 2003 Server (32 bit and 64 bit)
* Windows Vista