Copernick Desktop Search

Remember a few days ago I had written about the Lookout plugin for outlook which allows for very fast search through mails and through the file system.

Copernick desktop search too allows you to search through files and mails on your pc. I tired it out and it is very fast. Also I found the user interface to be very usable and good looking too.
They are providing a free download currently and on the faq page they say that they plan to always have one free version available.
At last, a set of tools are emerging which would enable to forget about 'Where did I save that file?'. Thanks Copernick guys and Lookout guys, you are making my life easier.

Are there tools like these for Unix/Linux systems already ?