Classical Net
Classical Net: Jan Dismas Zelenka
Excellent site with a wealth of info on who influenced Zelenka as well as who Zelenka influenced. Very comprehensive.
Naxos Digital Services
Naxos Digital Services: Jan Dismas Zelenka
A short biography for musician Jan Dismas Zelenka as well as listings of his work on both orchestral and vocal music.
Northern Arizona University
Northern Arizona University: Sojurn: Jan Dismas Zelenka 1679 1745
Brief biographical facts about Zelenka with lots of links to terms as well as references to Zelenka's music.