The .desktop files are stored in /usr/share/applications/hildon
The easiest way to view a list of them is to open up a terminal, type:
and choose the ones from there.

That being said, this app is still in a pre-beta state and really shouldn't be considered stable enough for popular use yet so be prepared for it to break. If it does, you best know how to recover from that (something which I suspect you don't. Then again, there is only one way to learn so let me know if you do find a problem and don't know how to fix it, I'll do my best to help).

I would however recommend that you wait at least until v0.3.0 comes out (it will have a GUI which will make this all a lot easier). I am busy working on the GUI and with any luck will have a usable version finished within the next 1-3 days.