Quite useful and worth the money. I'm using Devon Think with a rather large collection of pdf files, with protected pdf files I couldn't benefit from the indexing in either Devon Think or Mac OS X (and that's going to be even more important in upcoming Tiger). Strangely enough, the version numbering in Versiontracker is only slowly catching up with what my version of pdf-Recover is. I already have version 3.0.4, obtained via online update, and the Versiontracker number has just been updated to only 3.0.2. For a while, there was an even larger gap between version 2.x in Versiontracker and the actually available version 3.x...