So one thing I do like about the landing page is how it shows the constant activity on the website. But oh how treacherous & subtle an art it is catering to the lizard-brain! Imagine blackjack, but where 17, 18, 19, & 20 are all busts (in addition to anything over 21.)

Maybe you could create an overlay that pops up on the users 1st visit (that said everyone hated Clippy...overlays can be really annoying depending on how cumbersome they are.

Or maybe you could divide the landing page in half? One side being the constant stream, the other being...something more high-level? Like maybe buttons to take you to different tag-channels? a list of top tags & real-time post counts for each? Not really sure here; all subjective opinions of mine & liable to be bad.