Warner Bros.  has developed a Parseltongue Translator.  The online application allows you enter a message and have it translated into Parseltongue!  You can take this message that you have translated into Parseltongue and send the message to your friends.  You will just have to hope they are fluent in Parseltongue or know where to find a good translator.  You should check out the translator as it is loads of fun to play with.

See: BSCKids