The Shadow Ring are one of my favorite bands so I was pretty excited to hear that some pre-Shadow Ring songs would be released a few months ago. The Cat and Bells Club (or C&B as they're known for short) were the Shadow Ring prior to changing their name (and adding a member), perhaps as you'd expect they sound like pre-Shadow Ring songs. Even lower sound quality, weaker song structures, more mumbling. The same kitchen percussion, detuned guitars and monotone vocals.
I couldn't really find out much about this band. I think they're from Brooklyn. They sold their LP with (legal) drugs in the sleeve. Shuffling, fucked-up, retardo pop™. Can't find any links for this one so if you want it: http://www.myspace.com/freedomschoolrecords.
I'm way too late on my PRAP (only 3 months out) but my favourite Reatard band was Angry Angles.
Less anger than his other bands, more weird. They cover Wire, Devo and the Urinals (what more need you know?), the latter sounding like their biggest reference point. They were only ever active for a year or so and released a few EPs and a single, all of which are available for download here.