After launching Console running PowerShell 2, the Out-GridView cmdlet is supposed to launch another GUI window (not a console window) with output. On my Vista SP2 system, it works correctly in the built-in console window, but not Console 2.00.145 beta. A button appears in the Taskbar, but no window. You can right-click and choose to Maximize this window and it will appear maximized, but restoring it will hide it again. Making the PowerShell console window visible does not change this.
However, the second and all subsequent times you run Out-GridView, the grid window appears normally.
I don't know if this is an issue with PowerShell 2 specifically, or launching GUI windows in general.