This is a great notion, Cosmin!
After a while without development at all, I am coming back to life. I would love to see the Adobe applications as well as more browser-related prerequisite tests.
As per Adobe: I would be interested in not only in querying for a particular app, but also its version and locale (locale was used to determine the preset folder paths around CS2 and CS3, so it is quite important)
As per browsers: I would not only like to query for a specific browser installed but also to know which has been assigned as system default.
And I hope to get them in the free version - $500 is still too much for a scripter
Happy coding, everyone.