Adobe DesignTeam is offered on a subscription basis
It's interesting to see big software companies get into paying web services. This "solution for conducting online reviews, sharing visually rich files, handling version control, communicating with clients, and tracking projects with a diverse team of contributors" targeted at "independent Web and print designers and small creative teams" is offered on a subscription basis, starting at $39.95 per month. There's a 30 day free trial and no minimum time commitment.