The Pokéwalker is slowly becoming their ingenious design to let the world know that Nintendo truly does own us, I swear.
But all real-world-threat talk alike, those little buggers are indeed like a membership badge.
The even more ingenious aspect to it is that how little experience you get while walking, so you have the urge to keep it with you every second of your day (which only makes me wish I had it back when I was in high school taking gym).
Tangent: Also, your ideal team totally depends on your tier. UU is definitely Rain Dance teams, they dominate with Kabutops, OU is standard beat down, and Ubers is basically putting the Never Used tier in with a bunch of legendaries. Take your pick, Funk. =P