My top discs for 2008 are:
the Out_Circuit-Pierce the Empire With a Sound
the Slackers-Self Medication
Polar Bear Club-Sometimes Things Just Dissappear
Murder by Death-Red of Tooth and Claw
Anti-Flag-the Bright Lights of America
with a couple of the following EPs thrown in there:
Envy-Abyssal
A New Found Glory-Tip of the Iceberg
What surprises me is how little straight punk rock there is in that list. My current favorite is the Out_Circuit disc, too, which is very, very far away from hardcore and straight ahead punk rock in both lyrical style and musical aesthetic.
Granted, I have not heard the This Is Hell disc, or the Killing the Dream disc, and I enjoyed those last two releases very much, so this list is very much subject to change, but do give that Out_Circuit disc a shot. It's worth your time.