An article written about graphic novels by  Steve Raiteri, an experienced public librarian:

http://my.voyager.net/~sraiteri/graphicnovels.htm

A list of links to graphic novels also compiled by Steve Raiteri

http://my.voyager.net/~sraiteri/comicslinks.htm

No Flying No Tights - http://www.noflyingnotights.com/

Provides valuable information about graphic novels and choosing them.

An annotated list of graphic novels and comic trade paperbacks

http://www.geocities.com/dawnanik/grnovels.htm

BroDart information on graphic novels

http://www.graphicnovels.brodart.com/

Information and definitions about graphic novels useful for background   knowledge and ultimately building collections

http://spider.lawrenceville.org/depts/library/www/graphic_novels/graphic_novels_101.htm