Front-month, the most active contract, would have a symbol of ''CLU8'' (depending on who's powering your quote system, it might also be any of ''CL08U'', ''CL2008U'', ''CLU2008'').
The month designators for futures are, in order from January through December: F G H J K M N Q U V X and Z.
Found it - on Yahoo it’s CLU08.NYM
However, is that just for September (due to the “U” designator)?