I direct your attention to the folders tag.
It's being used for questions on:
- folders on the SD card/in the filesystem (you know, what we used to call "directories" until Microsoft brainwashed us)
- folders on the home screen that can hold multiple app icons
- email folders
- file folders become albums in the Gallery app if there are image files within (and they're picked up by the media scanner)
That's a mess.
I think the fourth issue there can be ignored; I'll be removing that tag from the offending question in just a minute.
The first two issues, though, definitely require disambiguation. I would suggest homescreen-folders for the second and either system-folders or file-folders for the first. I also think that, because it's unique to Android, that the folders tag should become a synonym of homescreen-folders (after we clean up the existing questions, of course).
I'm not sold on the names; I'd be more than happy to hear alternatives. I do think folders needs to be cleaned up, though.