Outpost Magazine's Global Travel Guide 2010
Hostelling International - Canada puts out a magazine called Outpost Magazine. If you are a lifetime member (like I am), you get the magazine for free each month. But they also post many of their articles online as well.
They have put out their Global Travel Guide for 2010 including "76 of the best adventure travel trips and treks from around the world."
Most of these are not cycling adventures, but if you were thinking of travelling to some of these spots, you might use this as a resource.