Hey Mr. Wombat...My raspberries have been happily producing loads of fruit too, even though they hardly get any sun where they sprung up from. The one and only Blueberry bush that I bought for a dollar (as a twig sticking out of some dirt) only grew to about 18 inches high after five years or so.
It produces about five or six berries now, which get stolen by birds!!!! I managed to get one for my own mouth this year; it was delicious.