Buck 65 is a gravelly-voiced white-boy folk-rapper from Halifax. "Blood of a Young Wolf" is the top track on my last.fm stats because it's so damned addictive. There's nothing complicated about his delivery or the music, but the song has a momentum to it that sets hooks in after a few listens, and bits of the lyrics will get stuck in your head.
"The Drinking Song" by Moxy Früvous has one of my favourite sing-along choruses of all time:
And the band played on As the helicopters whirred Drunk on the lawn in a nuclear dawn My senses finally blurred
Wax Mannequin rocks whimsical and absurd lyrics with a sincerity bands like Ween could never muster. He can sing lines like "Fuck up the night / shoot some diamonds and sparks from your torso" with a straight face, and is all the more awesome for it. You should listen to "Power Blaster" for the meowing if nothing else.
Telefauna is my friend's Montreal-based electronic indie-pop thing, and "Turbulence" is one of their most eclectic and catchy songs.
I just picked up Sarah Slean's latest album THE BARONESS (which is not, alas, a concept album set in the GI JOE universe) and "Get Home" is the song that's been stuck in my head all day, with its great "liars and cowards" chorus.
Bif Naked's catalog is pretty hit and miss, but "Everything" from her first album is a great fun little rock song somewhat reminiscent of The Breeders
And bringing it back to Halifax, Stan Rogers sings about 18th century nautical mishaps, from his live album. God damn them all!