XenDynamic seemed promising, but the demo site is down and his new site shadowed soul doesn't seem to be very responsive--looks kind of awkward at 1366 x 768 resolution, with elements overlapping. Also, the new WPMU tool bar, which for unknown reasons is now being forced on even logged out users, would cover up the XF "Login" tab. I've followed some sig links of folks who've posted in the thread, but nobody else seems to be using XenDynamic any longer, with this possible exception. XenPorta is a nice solution to the design problem, but it isn't a full-blown CMS by any means.
Maybe I'm looking in the wrong place. Any examples of this being done?
On a mildly related note, the notion of merging a robust CMS and forum software is hardly novel. Is it kind of baffling that nobody has developed a commercial solution to this? IPS comes closest, I suppose, but administrating IPB is a pain and it doesn't have the multisite functionality. VB4's CMS was just terrible. BbPress is a perversion that should be burned with fire. I dunno, I'm probably underestimating the challenges. And anyway, I like XF too much to switch.