KCScribbler (http://kcscribbler.livejournal.com/). She is awesome. A lot of her Trek stories are TOS, rather than recent movie, but they're universally excellent. She also really nails the subtle characterization differences between the recent movies' portrayals and the original ones. She leans toward Kirk-whump, though many of the stories have multi-character whump, but her characterization alone is well worth the reading. She's made me absolutely adore characters that I was previously "meh" about.

(She writes reeeeally good BBC Sherlock stories, too, if you like that series. And some Merlin stuff, which I haven't read because I don't watch it, but I know you like it, so I'd say worth checking out. ^^)