Exadel Tiggr allows you to create and share mockups online with any number of team members. This could be a very useful tool when building RichFaces applications.

One of the challenges that we always faced is how to create page mockups when working with remote teams. The usual approach is for a designer to create mockups in some format and then email them to the team or the manager for feedback and review. Of course this approach presents a number of challenges such as time delay, and difficulty in providing feedback to the mockups. You end up writing on the graphic with arrows and text suggesting where to place or move various visual components. Read more.

Max

http://mkblog.exadel.com