yah. theres a lot that can be done.
but not all of it involves building or buying new stuff.
free: re-organize.
if nothing is above counter level, then most things are within reach. make sure walkways have enough room for canes, walkers, wheelchairs. wider doorways are nicer than most.
cheap:
grip and grasp wanes in the later years - foam insulation over toothbrushes and utensils work amazingly well. looped rope pulls are easier to work than solid handles.
mid:
grab rails. everywhere.
home automation. those remotes with ginormous buttons? ugly as sin - but they work well. x10 controllers tend to be popular too (and cheap).
pricier:
ramps. wheels are good. the curb/step is the enemy of the wheel.
accessible cabinetry is really fancy, but rarely needed if you organize right.
plenty of guidelines:
http://www.adaptiveaccess.com/home_changes.phphttp://www.un.org/esa/socdev/enable/designm/AD3-01.htmhttp://www.wbdg.org/design/accessible.phphttp://www.vet.purdue.edu/cpr/bsd/building.htmlhttp://www.uniteddesign.com/accessible_plans.htmllots more stuff to think about - but i gotta get back to work