This article is from the NYPD Blue FAQ, by Dave Chapman, Alan Sepinwall and Jeff Knapp with numerous contributions by others.
There used to be a list of credits for the cast, but that
became unwieldy. But
http://www.stwing.upenn.edu/~sepinwal/credits.html has a list
of all the castmembers, with links to their bios on the
Internet Movie Database.
Steven Bochco and Mike Post have separate biographies stored
in the directory "people/" at the top-level of the Tardis
archive. These are maintained by Arthur L. Lortie . There's a
copy of the Bochco biography on my website.