Boolean search terms. Everywhere -- to search for a member, for a post, for a store item. Wild card control -- as in the Google model, where 'ca' will pick up 'california,' 'cat,' and 'incandescent'; but '"ca"' (with the quotation marks) will pick up only 'ca.' I can not remember the number of times I have tried to search for, say, 'PT' clothing and got 'pteranadon' and 'inept' and 'pup tent' instead. Also, I spend about half my time in forums where threads "bump" with the most recent activity, moving to the top. I prefer this, personally. It saves having to page through several pages then guess whether something new was added. Others may disagree.