CaptainSuck

1.) The Broadways are emotive, sarcastic pop-punk with a socio-political focus. Broken Star is one of, if not the best pop-punk album of all time, IMO.
2.) Discount is another pop-punk act (yeah, I'm a bubblegum chewer ), but the clincher for me's Alison Mosshart on vocals. She's in The Kills, now (a garage rock two piece), but Discount was definately her finest hour. Check out Half Fiction if you're interested.
3.) Crimpshine another early pop-punk band... pre-Fifteen if I'm not mistaken; it's got that talent-laden, dynamic sound Jawbreaker had... if you're a Monsula fan, you'll probably dig it. Duct Tape Soup is awesome, and could easily fit under the Emocore title.
4.) Second Story Window (not the modern-day Metalcore act of similar moniker) was a Hardcore Emo band with a member or two from Heroin... they've got a s/t LP and an EP; bloody brilliant stuff. Kinda like a tad more upbeat Heroin with whacked out vocals.

I'll hook you up tommorow if you'd like