What Launcher app lets me put the most on one screen?
Not a launcher app itself, but MultIcon (review link) lets you cram multiple icons into a teeny tiny space. Also available via cyrket.



Now, that unconfigured screnshot is the extreme example -- but the density ranges from 4 incons in the space of 1 on down. It's pretty handy -- plus it comes with its own shortcuts widgets to a few things. Can't have icons for normal folders, however. Bummer.