I don't think many people would care about applications to be honest. My reasons:
1. Most apps are updated many times. Is there any point cataloguing Wordworth v1, v1.1, v1.2, v1.3 etc etc
2. No screenshots are worth looking at for 99% of apps. Seen one word processor, seen 'em all.
3. I don't know many people that would download and install an emulator to run an app! They will for an old game, but apps?
Still, nothing stopping you starting a project to catalogue them...