Other
Georg Philipp Telemann: A Biographical Note
A nice, in-depth biography on composer Georg Philipp Telemann is found here. Details on his compositions and life as a composer are given.
Other
Baroque Composers: Telemann
Brief bio with very organized list of works condensed and catalogued for easy perusal.
Classical Net
Classical Net: Basic Repertoire List: Georg Philipp Telemann
Listing of recorded music. Good reference for recordings as well as understanding how prolific Telemann was!