More BBCode. I personally miss:
* nocode/noparse (allows things such as displaying formatting tags - convenient when you want to give character sheet templates to players, for example) 
* list
* underline 
* changing size (titles, anyone?)

Also, please allow multiple empty lines? (Horizontal lines are neat, though.)
Would likewise like to see read/new posts/you have posted in indicators before threads, just as another mentioned above.