Besides all the obvious addons I'd like to see for my A4k like PPC card, PCI bridge and such there is one thing I'd love to have:
A Zorro II add-on for the A500, with pass-through, so I can put my old A500 to some good use. One slot is enough, two is preferred. Want to be able to add at least a nic and a gfx-card to it.
The pass-through is important for the harddrive-controller.
That way I could have my 500 run as a webserver or something like that.