I think Newgrounds has come a long way and is improving all the time. Anyway here are my suggestions for this amazing site:
1. Create Art Portal (There are many talented artists on this site).
2. Adding favourite art images to our accounts.
3. Adding favourite art authors who have submitted art to the art portal to our accounts.
4. Adding favourite games to our accounts.
5. Adding favourite game authors who have submitted games to the portal.
6. Consider a games portal. I think it would be very difficult to shift all the games somewhere else and update alot of pages because of it. This still could be possible when you have nothing else on your hands. Please keep it in consideration until you've experimented with it abit.
7. Move all the literature section to the Newgrounds Mag section as you said you would. If you don't want to do that anymore just remove the link in the Newgrounds Mag section that says your going to move it "here". Whatever you do with it please update it.
8. Finish the collections pages and keep updating everything.
9. Update the games pages and keep updating everything.
10. Move all the old Newgrounds stuff in a new section called "Newgrounds Retro" or something.
11. I love Newgrounds Mag but maybe you could re-design it so it looks like an actual magazine. That would give it a very cool look and open up all sorts of possibilities for it.
12. Pico 2.
13. More games from you...Tom.
14. Being able to add favourite audio to our accounts.
15. Being able to add favourite audio artists who have submitted something to the audio portal.
16. Alien Hominid PAL version please.
17. The jukebox thing in the NG Mag should be in the Audio section it makes sense.
Well those are my suggestions some of them may be a little too ambitious but Newgrounds is an ambitious site.