I just wrote a cyclocross article for the Suite101 website.
Cyclocross bikes, also referred to as cross, CX or cyclo-x, are a unique type of racing bike. Cyclocross races generally occur in the fall and winter.
Check out my article, Intro to Cyclocross Bike Racing; CX Bicycles are Part Mountain Bike and Part Road Bike, when you get a chance.
Lynn Smythe AKA the Bike Diva