Conveying my "geek" skills to an employer

Anonymous writes: How can I tell my future employer that I have an excellent ability to work in a team but can also handle individual stress exceedingly easy thanks to my 7 years of playing Counter-Strike, without mentioning the game part? I've seen articles talk about how organizing a successful World of Warcraft guild can develop great leadership abilities, but how do you actually put it in your letter or CV?