Ditto - dead easy to use (despite the Portugese manual!). Only played briefly but so far:
Just click on a folder/drive and it lists all the PDF files in that subtree (you can toggle subfolders on and off so you can restrict to a single folder or search a whole drive). You can then view those and keep a snapshot of the files you have found. great for finding PDF manuals quickly (click on C:\Program Files).
Plus you can quickly and easily extract images from any PDF file.
That's all I have found so far but there are lots of things I haven't played with yet!
Anyone speak Portugese?