I don't know if I'm "defined" by anyone, since I write so seldom, but here are three I like:
1. Fraser Being Fraser is a meta on writing Fraser I did for ds_workshop, and it may be the piece I'm most proud of. I think I did a pretty complete character study of Fraser and how to write him without falling into traps of cliché and fanon. I know a lot of people tend to shy away from writing Fraser because they find him difficult to write. He's always been easy for me--it's like he makes camp in my head when I'm writing--so even though I'm not a huge self-pimper (to say the least), I still refer people to this when they're having trouble writing Fraser. Because you can never have too much Fraser.
2 Where the Women Are Strong, the Men are Good-looking, and the Mounties are Above Average. Written for the second DS Flashfiction Badfic Challenge, I had more fun writing this than any other fic I've written, ever. I'm a big fan of A Prairie Home Companion, and I've wanted to write a Guy Noir/dS crossover since a comment conversation I had with isiscolo a few years ago. I was very pleased with the way it turned out and the positive response I got--even my non-fandom pro-writer housemate liked it. :)
3. Light the Sun. dS Seekrit Santa is my favourite fic challenge, and I never miss a year, even when (like this year), I've been away from fandom a lot (POLITICS ATE MY *SOUL*, PEOPLE, and I'm trying desperately to get it back!). This was the first story I wrote for dSSS, back in 2006, and also my first real dS story (aside from one horrible attempt at NC-17 which may have come first but that I'm pretending doesn't exist and you should too). I really like this one--I think I managed to make it sweet without tipping over into sappy, and I even managed to write Vecchio in a way that doesn't make me cringe (note: I love Ray Vecchio so, so much--it's just that his voice doesn't come to me easily).