In our company we do a lot of web design, and this usually means showing around PhotoShop files. We've been using Radio since the beginning, each designer uploading jpg versions of the sites under construction in their personal weblogs. Today we found another interesting approach.
With the QuickTime plug-in, you can also open PhotoShop files, and you can do that in the browser (if you use MacOS X you need to fix this in the preferences because it's broken in the default install).
So, starting today, our designers are saving all their PhotoShop files inside Radio UserLand/www/layouts/. Since they save frequently, anybody is able to follow the development of a design simply reloading the file in the browser in real-time.
Of course, this is possible because we have our own rcs server on our LAN, otherwise moving 10Mb files around would be a problem.