I would love a limit on the Tags page (maybe one that works like the hubwheel selectors on the Chatter page) to ignore tags with fewer than x uses, with a default that favours older tags.
For people like no-cheating this would mean that older but more established tags are more likely to show up, as a gentle introduction to the wider use of tags.
For miserable fuckers like me it would mean that I don't have to contemplate single post droppings like #floorproducts, #vinylflooring, #laminateflooring, #windowfurnishing.
And as a cherry-on-top bonus can the tags page ignore all the tags created by users I have ignored? E.g. that guy I have ignored but his tags still show up in the New Tags and Recent Tags section like pestilent boils.