Fans of Lost World type games may be interested in some harticles on the Cryptomundo site that sow early 20th century newspaper stories on the search for the Mokele-mbembe, a dinosaur-like creature thought by some to still be alive in Africa. You can also look at the articles in a pdf format.
Of course no one knows exactly what a dinosaur looked like, but Andrew Thompson will tell you how he painted a very nice looking one for his land that time forgot miniature wargame.
Dinosaur Cowboys is a set of role playing / miniatures rules that reminds me of the old comic Cadillacs and Dinosaurs. It looks like a lot of fun.
Tackling a Tyrant is a set of pulpy dinosaur hunt rules for 28mm figures.
Here are a set of free wargames rules for conducting a Dinosaur Hunt.