In terms of Tegan and Sara my all time favourite song is My Number.
That's exactly what I was going to say. I'm not a big fan of The Con (the song), but I like 'Nineteen' off of that album.
Broken Social Scene I am just getting into but adore the songs Lover's Spit, Cause=Time, Swimmers, and Almost Crimes.
Those are all good. 'Anthems for a Seventeen Year-Old Girl', 'Pacific Theme', 'KC Accidental', and '7-4 Shoreline' are also favourites of mine. Most of those are off of You Forgot it in People of course, which is just a great album.
Emily Haines is just pure awesomeness. I've been listening to the song Eden lately, and some of Metric's songs (Dead Disco, Wet Blanket, Succexy).
I don't know Eden. All I have of her solo stuff is the Soft Skeleton album, from which I really enjoy 'Dcotor Blind'. From Metric, I like almost everything off of Grow Up and Blow Away and Old World Underground. But I do really like 'Police and the Patriarch' from Live it Out, too.