I first found Perri Smith through her X-Men fanfic. She's got a trio of stories called The Delphi Set that feature Deadpool at his wittiest and snarkiest, as well as some fine ensemble work for various other characters. Now she has a new trio in a different fandom: Triptych is a series of achingly beautiful vignettes about the women on Angel this season -- Fred, Cordelia, and Darla. Each story resonates with insight and a true-to-character (albeit in second person) voice.
Many Loves just won an Undead Award for Best Spike, and with good reason. It's epic, incorporating tons of canon and history, bringing us from the picture of a foppish human William in "Fool for Love," through years and years and years of relationships and blood, to the vampire we know and love (and in many cases, lust after) post-"The Gift."