While Wookie Jedi are not unheard of they should be very rare. The reasoning behind this is the fact that Wookies have a lifespan of around 400 years. This means force sensitive Wookies will be born in much larger intervals than shorter-lived races. You could probably expect a new force sensitive wookie every 1,000 years or so.
George Lucas has declared no more Wookie Jedi will be created for the Expanded Universe. This leaves Tyvokka, Kirlocca and Lowbacca as the only official Wookie Jedi in the Star Wars Universe. Horororibb has been speculated to be a Jedi as well due to the spelling of the name, but its not official. The Wookies have most likely been limited due to overuse. (three in about a 50 year period)