I know there's been plenty of chatter here about this software before. 2.0 is officially releasad:

http://www.devon-technologies.com/

New features are listed here:

http://www.devon-technologies.com/products/devonthink/devonthink2.html

I'm currently evaluating this program and it looks really solid. An iPhone/iPad) version is apparently on the way in the near future.

Tom S.