The basis of my methodology is to use specific forms of address to signal that I'm role-playing. OOC conversations tend to be very informal, even with strangers. Usually there are no spoken greetings, and often even no names are used, but just forms of 'hey you n00b'. I've noticed that being formal in forms of address often immediately sets a specific tone to the conversation.
Additionally, it helps to get non-RPers to 'tag along' with your play if you address them with proper deference as Lord X. Makes them feel empowered and less likely to play along with you.
Merdaneth uses a whole range of forms of address, often specifically meant to put the person addressed into a certain place. I'm fond of using 'traitor', 'terrorist' or 'heretic' as a title with enemies while remaining otherwise polite. It gives a definitely signal about your relationship with the person to everyone that's hearing it.
Sister, Brother for fellow Amarr that I like. Crusader, pilot or soldier for milita members, Lord and Lady for people with high station, but I also often look up a person's corp title, and use that one for extra effect. Admiral, Cardinal, Overseer, etc. etc.
I find it a very simple, easy to use but powerful RP tool.