the ramones - self-titled
the clash - self-titled (uk edition, of course)
the above two albums are the important ones. sex pistols' album is overrated, in my opinion. so the guy died, and while i guess that makes them more punk, it makes them even more hyped. i like the new york side of punk more myself (ramones), but then again i have been to cbgb's and felt the magic that was once there.
for early, early 80's i'd have to go with the misfits. the static age ep is still my favorite to listen to, and it simply never gets old. "ooh baby, when you cry, your face is momentary.."
for 90's pop-punk (what i like to call, the "fun kind"), i still say blink182's album dude ranch is among the best collections of songs that i've heard. hysterical, simple, and catchy. green day's earlier work also has a place in this category.
and of course, who could forget the queen of this next century's punk: