I yearn for bbcode, the thingie that lets you go back a step on how deep in the forums you're at (I think somebody called them breadcrumbs?), custom emotes, a better place for the report user button that isn't right where the new post/reply thing should be, better age calculation (my birthday is in november, I'm not 33 yet!), the ability to set avatar via externally linked image...

a lot of things, really.