I got a Fitbit for Xmas. I think it's great, but it's way too easy to accumulate 5,000 or more steps per day. The default setting was counting 14 steps for every 11 I took, so I manually adjusted the stride..but it still seems too easy***. I get $25 credited toward my medical costs (via medical insurance plan at work) for every 100K steps, which I'm able to reach 3x per month.
*** I went for a 2.5 mile run this morning, but otherwise have been at my desk all day, except to get up for lunch and occasion bathroom breaks, and I'm already at 9,932 steps.