The closest equivalent of the Canon 40D should be the Sony A700 (and not the far cheaper A200). I am confident that the A200 should be fine for the course, but the A700 is in another class (fast focussing and a bigger brighter viewfinder, far smoother shutter mechanism, features.... and certainly heavier). I would not want to be without the in-body image stabilization of the Sony (too much coffee in my system).; the image stabilization of the Pentax K10 did not work as well for me, but I have heard good things about the Olympus anti-shake (I loved the handling and ergonomics of the Pentax, though).
Cameras from all DSLR suppliers should fit the requirements of the course;
your wife should definitely try them out. In my experience women tend to be much more choosy regarding the ergonomics of the camera.
Feisol makes very well regarded tripods sold per mail-order from Taiwan. You could get a light carbon fiber tripod there for the same price as a regular tripod from the big name brands.
http://www.feisol.co...english/feisolen.htmhttp://www.feisol.ne...-tripods-c-1_12.html