Siilihai is like Thunderbird for email or Pidgin for messaging. It can support SimpleMachine forums, all it needs is someone to code a parser, which should take 15-30 minutes if you know HTML (and a bit longer if you don't). Let's fire it up!
I'm imagining a heiarchy of circles. First the standard Circle Dock of icons, each one containing it's own cluster of applications & files, a bit like you can on object dock. If you hovered over any of those icons, that circle would be pushed to the top left, and be replaced by a fresh circle that balloons out of the applications it represents. Like so.I hope that's reasonable?