Vinyl-Punx.de
This website is a great discography reference on Deutsche-punk from 1977 on. It's organized by bands, labels, and compilations, and it includes pressing information, cover scans, and tracklists. Also features a small section on Finnish punk.

Punk-Discographie 1977-1984
Another good discography resource, this site compiles information on German, Austrian, and Swiss bands, including tracklists and small cover scans.

Tommy's Punkmusicshop
I'm not really sure what the rest of this site is about, but there's a section here with a bunch of old German hardcore punk mp3s.