There are a number of hardware hacks, hardware bugfixes and hardware projects strewn all over the net, perhaps there could be a D-I-Y hardware section, with photos, circuit diagrams and reasonably complete instructions for completing the work. although they exist somewhere, they might one day be lost, but if held on amiga.org their availability to the community would be assured.
May I vote for an open source 040/060/ppc card as one of the first amiga.org projects.