They have quite a few guests attending. Looks like a good list of people.
http://www.nesfa.org/boskone/program.html

Confirmed Program participants as of January 27, 2006
Claire Anderson
Ellen Asher
Lenny Bailes
Elizabeth Bear
Judith Berman
Beth Bernobich
Patricia Bray
Ginjer Buchanan
Michael A. Burstein
James Cambias
Jeffrey A. Carver
Bruce Coville
F. Brett Cox
Kathryn Cramer
Susan Hanniford Crowley
Don D’Ammassa
Daniel P. Dern
Bob Devney
Cory Doctorow
John Douglas
Debra Doyle
Thomas A. Easton
Bob Eggleton
John Farrell
Greg Feeley
Michael F. Flynn
John Ford
Esther Friesner
Irene Gallo
Craig Shaw Gardner
Deb Geisler
Janice Gelb
Donato Giancola
Greer Gilman
Geary Gravel
Leigh Grossman
Jess Hartley
William K. Hartmann
David Hartwell
Daniel Hatch
Jeff Hecht
Chip Hitchcock
Walter H. Hunt
Elaine Isaak
MaryAnn Johanson
Robert I. Katz
James Patrick Kelly
Dan Keohane
Tom Kidd
Daniel Kimmel
Rosemary Kirstein
Ellen Kushner
Geoffrey A. Landis
Sharon Lee
Fred Lerner
Paul Levinson
Shariann Lewitt
Timothy Liebe
Ernest Lilley
James D. Macdonald
Steve Macdonald
Ken MacLeod
Jim Mann
Laurie Mann
Darlene Marshall
George R. R. Martin
Parris McBride
John McDaid
Clayton L. McNally
Beth Meacham
Steve Miller
Sarah Monette
Patrick Nielsen Hayden
Teresa Nielsen Hayden
Naomi Novik
Mark L. Olson
Priscilla Olson
Margaret Organ-Kean
Chad Orzel
Joshua B. Palmatier
Paul Park
Sheila M. Perry
Tamora Pierce
Larry Pfeffer
Steven Popkes
Omar Rayyan
Mike Resnick
Faye Ringel
Don Sakers
Steven Sawicki
John Scalzi
Karl Schroeder
Darrell Schweitzer
George Scithers
Melissa Scott
Delia Sherman
Joe Siclari
Wen Spencer
Allen Steele
Edie Stern
Ian Randal Strock
Charles Stross
Geri Sullivan
Tim Szczesuil
Cecilia Tan
Paul Tremblay
Mary A. Turzillo
Kestrel Verlager
Peter Weston
Eleanor Wood
Jane Yolen
Ann Tonsor Zeddies