That page was helpful too... and somewhere along the way, I managed to find a pretty decent Excel spreadsheet of a BUNCH of different RAM modules & their corresponding part #s, brands, and chip layouts. That helped me more than just about anything. 

Tonight I'll be going through the rest, all of which are 72-pin SIMMS and a few miscellaneous ones. There are two very long 84-pin modules that I don't recognize at all. I figure they're also PC memory. Then there are 3 or 4 "Apple 512K/2M" modules. Didn't find much on them either. Also found a couple 256k VRAM modules that I plan on putting in my Q840.