The Language Creation Society has kindly provided some audio samples of a few of the words David J. Peterson has created for the Dothraki language. It’ll be great to hear more in the future as the series, and the language, progresses. The LCS have started up a Facebook Page for Dothraki, as well as a Livejournal account.
George R.R. Martin has shared his own relationship to invented languages, and finishes up with needing to find out what, “It is known,” is in Dothraki.