Not really pertaining to your original question and disregard if you're a vegetarian, but I was just using my new..ish dehydrator and came across your thread.
You may want to check this out if you haven't already:
http://www.youtube.com/watch?v=T04w9BqF2iw
Lean ground beef de-rehydrates really well. Rotini with meat sauce, with instant rice etc. I'm lazy so I just open a jar of store bought sauce, and put it straight into the fruit roll up tray, dehydrate and then put it into the blender to turn into powder.
Slow cooked beef stew, potatoes and carrots (cut into smaller pieces after cooking) works really really well. The beef, and vegetables are super tender from slow cooking which makes them rehydrate well. I do the same thing to the liquid portion of the stew as the spaghetti sauce.
Add a little instant rice and sure beats oatmeal for breakfast.
You'll be shocked at how light a stew with 4 kgs of raw materials ends up being dried.
I haven't dried any fruits or vegetables yet, so can't be any help there.
Hope this helps.