Klingons are cool.  It is a fact that more people in the world are fluent in Klingon than are fluent in Esperanto, the international language developed by the United Nations.  If you want to learn Klingon you can visit the Klingon Language Institute, a non profit organization created to promote interplanetary communications (between Earth and Klingon).  http://www.kli.org/

Personally I am going to wait for Rosetta Stone to come out with their Klingon Language version.