From the CO website:

Star Alliance Gold Elite members may also access Presidents Club lounges and designated Star Alliance Gold lounges. Continental, United and US Airways Star Alliance Gold Elite members may access any Presidents Club, Red Carpet Club and US Airways Club on the day of international travel. All other Star Alliance Gold Elite members may visit any designated Star Alliance Gold lounge before departing on a domestic or international Star Alliance member airline flight.

http://www.continental.com/web/en-US...ralliance.aspx

So, *G members can visit an RCC club with a domestic ticket?