Wide world of wines used to maintain a listing of corkage friendly places in DC but I can't find it. Off the top of my head, Bistro Francais $10, Coppis Organic $15, Caucus Room has waived corkage for me in the past. Lavandou $15 but no charge on Mondays. Call ahead and ask. Johnny Rooks rules listed above are good-share the wine and tip well and you shouldn't have any issues.