[Apologies for Cross-posting] Dear Colleague, The on-line registration page for the ACM 2004 Conference on Computer Supported Cooperative Work (http://www.regmaster.com/cscw2004.html) is now open. The deadline for early advanced registration is Wednesday, October 13. The conference will be held at the Hilton Chicago in Chicago, IL between November 6-10. You can make reservations on-line at our conference hotel by visiting http://www.acm.org/cscw2004/accommodations.html. We invite you to register soon, to take advantage of discounted rates and to ensure a spot in our most popular tutorials which have limited numbers of seats (http://www.acm.org/cscw2004/prog_tutorials.html). We also invite you to take a look at the rest of our conference program. We have an exciting mix of technical papers, demonstrations, workshops, and plenary speakers (http://www.acm.org/cscw2004). If you have any questions or comments, please do not hesitate to contact us at cscw2004-info@acm.org. We look forward to seeing you in Chicago! CSCW 2004 Co-Chairs Gary Olson and Jim Herbsleb CSCW 2004 Publicity Chair Madhu Reddy