Jeremy writes that he's having trouble generating XCB descriptions for the XFree86VidMode extension. I believe we have a fine solution—"don't bother". Before applications get around to using XCB and XFree86VidMode together, I'm hoping we'll have the hotpluggy sweetness version of RandR widely available instead, which should supplant this apparantly difficult to XCB-ify extension.
In other RandR news today, Eric has started restructuring the Intel driver to expose the full capabilities of the hardware and make it possible for RandR++ to achieve its full potential. I'll be demonstrating whatever we've got working this weekend in Boston at the Gnome Summit, so if you're coming, prepare to be stunned by our fabulous new CLI-based UI for monitor reconfiguration.