Hi Patricia,
Just in case you don't already know about these resources, I recommend that you look at:
IWCA - International Writing Center Association
They have information on subscribing to WCenter, a Writing Center listserv, whose archives will have lengthy discussions on these topics.
Also, look at the Writing Center Research Project 
It compiles the largest survey (that I know of!) on writing centers.  
Good luck!  
-Marcia Toms

Marcia Toms
Associate Director 
Undergraduate Tutorial Center
Division of Undergraduate Academic Programs
North Carolina State University
Campus Box 7118 / 101 Park Shops 
Raleigh, NC 27695-7118

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