>>64
That's what the AIDS tagline would be for. I agree that, right now, you can spot most of the shitty 4chan clones out there just by looking at the footer and searching for the word “kusaba,” but there are sadly some other boards that aren't strictly modeled after 4chan and 7chan using it as well. (see touhouproject.com)
Out of my head, thread hiding, image expansion and noko (last one is trivial to hack in) are useful. Stickies are debatable. WAHa is traumatized by how 4chan used to misuse stickies (hop on to 7chan to see sticky misuse taken to an extreme), so he'll lobby hard against them.
Actually, stickies themselves are unimportant. What I'd like would be the ability to make a thread immortal, so it would be immune to pruning. That way, you could link to it from the banner, like WAHa does in the Wakaba and Kareha support board. Problem solved.
Capcodes are useless Something Awful faggotry (albeit trivial to hack in), wordfilters are cancer, USER WAS BANNED FOR THIS POST only makes people spam the board with "MODS = GODS!!!" shit. Spoiler images/tags can be useful for some boards, on others, they just get used for humorous intents. Why the hell do we have spoiler tags in /prog/?