I will continue the shameless parade of selfpromotion. If you like short stories, I have a couple TNG shorts at www.fanfiction.net/~ghiaman
If you're looking for a series, I have recieved much praise for Nightingale's Song, a fanfic about a hospital ship trapped behind enemy lines during the Dominion war. It takes place in the days surrounding the first episode of DS9 season 6. A couple of DS9 reaccuring characters even show up. The link is in my sig below.