First of all, the big question is, what edition do you prefer to play? It's been soooo long since I've played but me and my friends really prefer 3.5 over the new 4th edition (a bit more user friendly but a more limiting experience imo).
Any DM's wanna share some of their homebrew?
System Reference Documents (Online Players Handbook, Monster Manual, Etc.)
Host Online Character Sheets
So this OP is just a tad bare right now, but if some good discussion is generated I'll continue updating it with some resources and such.