1. All your convention paperwork/receipts to check-in.
2. Poster tube(s).
3. A comfortable backpack
4. Comfortable shoes.
5. Deodorant.
6. Water, soda, & snacks.
7. A book to read while waiting.
8. Camera.
9. Pens (felt-tip and regular) and pencil.
10. Notepad (either lined or drawing for autographs or sketches).
11. Personalized programming pages/notes/grids for the day so you know which panel rooms or autograph areas to go to.
12. Bags and boards for the comics you buy.
13. Cell phone.
14. Ipod.
15. ID.
16. Money.
17. Convention map.
18. Mints or gum.
19. Be early.
20. Be polite.

There is a Comic Con website on myspace if your interested:
http://groups.myspace.com/sandiegocomiccon