And unless an electric bike has regenerative braking, which lets the motor help slow you down while charging the battery at the same time, expect to change the brake pads more often than on a standard bike.

WSJ: The Best Electric Bikes: High-Wattage Wheels

Backroads, a California company that offers bike tours of China, Bali and northern Thailand, lets participants cycle at their own pace and take a break from biking with sidetrips like elephant trekking or whitewater rafting (Tel: 1-510-527-1555).

CNN: ASIANOW - TIME Asia | Travel Watch

Charity Miles lets you raise money for the cause of your choice while you walk, run or bike.

CNN: 5 impact-worthy apps

When you find out that your Kryptonite bike lock can be opened with a Bic pen or that a bug in Java lets malicious websites take over your computer, the fix is in your hands: You send in your lock for a replacement or disable Java in your browser.

FORBES: Move up http://i.forbesimg.com t Move down

The megaphone lets you send a message to your less-active friend telling them to go for a walk, run or bike ride -- but you can only bully them once ever seven days.

CNN: Fitness tools that tap the power of your friends