I just think the ability to favorite/follow tags would be nice and useful. It would make things easier for people who like to follow specific artists' work, like myself, as well at those with specific kinks they like to follow along with, and so forth.
I imagine it could work by simply having a tab, similar to "hot" and "favorites", that works by making an "or" based search for the favorite/followed tags. This could also allow for more advanced favorite/followed tags if someone wanted to follow along with a combination of tags.