The question of how to improve fruit yields and the role of pollinators
comes up quite regularly. This includes "vegetables" that are botanically
fruits, eg tomato, chilli etc.
Here are two references which are useful:
A nice simple summary of the role of bees
http://en.wikipedia.org/wiki/List_of...inated_by_bees
More details including literature references for the very keen
http://www.beeculture.com/content/pollination_handbook/
David