By E. Brown
If you’re a Web designer or part of a Web development team you gotta check out iPlotz. This subscription based SaaS has some very cool application for collaborative wire-frame development and workflow.
Browser-based, it works with Mac, Windows, and Linux. You can easily add and delete pages from your sitemap. THen add images, fields, navigation, etc. and size them accordingly. You can even link from within and without of your wireframe project.
To me, the real power comes in the collaborative aspects. You can invite others to work on the project and comment regarding any element or component of the pages being built. You can then assign to-do’s to members that only they can see as you start to move the project into production.
Check it out. For $99/yr and a gig of space you cannot beat the time savings.
WeirdGuy Creative 
thanks for the mention. We have a few more features to add before I’m totally happy with it..:-)
cheers
mark vernon
iPlotz