I am the proud new owner of a Wii Fit. What enticed me to buy it? Basically it looked fun and should allow me to work out and have fun from the comfort of home - especially when I can't make it to the gym. I can honestly say I really like it. The exercises are easy to follow and have a decent amount of variety. Check out the wikipedia article for more details.
The Wii Fit designers were also very clever. When you first begin using Wii Fit only a limited number of exercises and games are available to you. You can only unlock the other activites by spending time using the Wii Fit. Every minute that you spend using the product is accumulated in a piggy bank that you can use to unlock various other activities.
I'll be blogging about my experiences using the Wii Fit as an gamer-cise (game + exercise) platform over the next few weeks. For those of you sitting on the fence - go for it! Wii Fit is a blast!