PBS
Nh Pbs: Nature Works: Angiosperms
A brief, yet colorful segment on angiosperms can be found here. This well written information also includes a series of pictures to serve as examples.
PBS
Nh Pbs: Nature Works: Angiosperms
This colorful site focuses specifically on the role of the flower, an explanation of pollination, and the difference between dicots and monocots.