PUBLICATIONS BOARD
Co-Chairs: Ronald F. Boisvert and Holly Rushmeier
Board Members: Gul Agha, Michel Beaudouin-Lafon,
Jack Davidson, Carol Hutchins, Ee-ping Lim,
M. Tamer Ozsu, Vincent Shen, Mary Lou Soffa,
Ricardo Baeza-Yates
PUBLICATIONS OFFICE
ACM, 2 Penn Plaza, Suite 701
New York, New York 10121-0701, USA
+1-212-869-7440
FAX: +1-212-869-0481
EDITORS-IN-CHIEF
Richard Anderson & Jon Kolko
GROUP PUBLISHER
Scott Delman
EXECUTIVE EDITOR Ken Korman
MANAGING EDITOR Denise Doig
ART DIRECTOR Andrij Borys
ASSOCIATE ART DIRECTOR Alicia Kubista
ASSISTAN T ART DIRECTOR Brian Greenberg
PRODUCTION MANAGER Lynn D’Addesio Kraus
COPY EDITOR Kate Crane
SUBSCRIPTIONS
Various subscription rates are available;
please see the interactions website at
http://interactions.acm.org/subscribe.php
for more information.
Single copies are $13.00 to members,
$20.00 to nonmembers. Please send orders prepaid
plus $4.00 for shipping and handling to ACM, General
Post Office, P.O. Box 30777, New York, N Y 10087-0777
or call +1-212-626-0500. For credit card orders,
call +1-800-342-6626. Order personnel available
8:30-4: 30 EST. After hours, please leave message
and order personnel will return your call.
FORUM EDITORS
Lifelong Interactions: Alison Druin
On Modeling: Hugh Dubberly
Sustainably Ours: Eli Blevis
Timelines: Jonathan Grudin
Under Development: Gary Marsden
(P)REVIE W EDITOR Alex Wright
COLUMNISTS
Ps & Qs: Elizabeth Churchill
The Way I See It: Don Norman
True Tales: Steve Portigal
CHANGE OF ADDRESS
acmcoa@acm.org
For other services, questions, or information:
acmhelp@acm.org
CONTRIBUTING EDITORS
Elaine Ann, Dave Cronin, Ame Elliott, Marc Rettig,
Katie Minardo Scott, Lauren Serota, Molly Steenson,
Mark Vanderbeeken
IN TERACTIONS ADVISORY BOARD
Jonathan Arnowitz, Apala Lahiri Chavan,
Elizabeth Dykstra-Erickson, Shelley Evenson,
Robin Jeffries, Kun-Pyo Lee, Aaron Marcus,
Lisa Neal, Ian McClelland, Raquel Oliveira Prates
ACM Copyright Notice
Copyright © 2009 by Association for Computing
Machinery, Inc. (ACM). Permission to make digital or
hard copies of part or all of this work for personal or
classroom use is granted without fee provided that copies are not made or distributed for profit or commercial
advantage and that copies bear this notice and full
citation on the first page. Copyright for components of
this work owned by others than ACM must be honored.
Abstracting with credit is permitted. To copy otherwise,
to republish, to post on servers, or to redistribute to lists,
requires prior specific permission and/or fee.
Request permission to publish from:
Publications Dept., ACM, Inc.,
Fax +1-212-869-0481 or email permissions@acm.org
FOUNDING EDITORS
John Rheinfrank & Bill Hefley
interactions (ISSN 1072-5220) is published
six times a year in January, March, May, July,
September, and November, by the
Association for Computing Machinery, Inc.,
2 Penn Plaza, Suite 701, New York, NY 10121-0701.
Periodicals postage paid at New York, N Y 10001 and at
additional mailing offices. POSTMASTER: Please send
address changes to interactions, ACM, 2 Penn Plaza,
Suite 701, New York, N Y 10121-0701.
PLEASE VISIT OUR WEBSITE
http://interactions.acm.org
Month + Month YYYY
EDITORIAL INFORMATION
To contact interactions, e-mail
our editors at eic@interactions.acm.org,
or mailbag@interactions.acm.org
The EiCs generally respond to inquiries, including
responses to unsolicited manuscripts, in 2-3 weeks.
For other copying of articles that carry a code at the
bottom of the first or last page or screen display,
copying is permitted provided that the per-copy fee
indicated in the code is paid through the Copyright
Clearance Center, 222 Rosewood Drive, Danvers,
MA 01923, +1-978-750-8400, +1-978-750-4470 (fax).
ADVERTISING
ACM Advertising Department
2 Penn Plaza, Suite 701,
New York, N Y 10121-0701
(212) 869-7440 FAX: (212) 869-0481
DIRECTOR OF MEDIA SALES
Jonathan Just
jonathan.just@acm.org