Could do with more work.
First, it doesn't find all of my apps (only found 62 of a possible 272). Not sure where it looks, or if it knows how to check nested folders.
Second, it shows duplicate apps (or shows different versions of the same app, so it's impossible to know if I own both versions, or that it is offering advice about ANY version).
Third, it offers no way of checking what version you actually have: it appears as though it merely finds apps, but does not care what version each is. AppFresh does a much better job in this regard.
Lastly, the data is plainly false in some regards: for example, it claims that 'Disc Cover RE' 'Doesn't work at all under SL' - yet it opens just fine on mine.
It might be simpler just to head over to the wiki first?