Actually I've been thinking just the same thing, that's why I've been motivated to try to help out with working on the wiki lately and scouring the net for info on all the hardware, obscure or otherwise that was available for the ST.
It's very important that not only is all the information on great hacks and projects for the ST range kept safe and presented in the best way, it's also vital that any of us who come across some unknown hardware have at least a chance of finding out a little about it and how it may be used.
Ideally I'd like to see detailed step by step walkthroughs for all the projects, along with lots of suitable photographs and diagrams. I'd also like a parts list with estimated prices along with suppliers covering the main markets, UK, US, Germany, France.
Likewise for the hardware database, I'd like to see all the things you've mentioned, detailed photographs, front, back, installed, etc. Jumpers and options, manuacturer, release year and price , etc etc. And of course PDF manuals/install instructions available for download.
This would be such an invaluable resource if everyone just contributed a bit and would build up quickly. I've been amazed just how many obscure products there are out there that I'd never heard of but found with a little research.