If you have a small child (like under 35 pounds) and don't have one, go get one! I had been using a Baby Bjorn for the past 6 months and, while it does its duty (especially in NYC with Emily's snowbear outfit and over heavy coats!), the Moby Wrap is amazing. Phillip and I went on a walk tonight for about 35 minutes. We went approximately a mile and a half. When using the Baby Bjorn, I could never have gone that far. I know I was carrying 14.5 pounds more that my normal weight, but I could hardly tell! My shoulders never hurt, my back never hurt and Emily enjoyed it (though I think she'll be facing out from now on!).
P.S. Thanks to Granddaddy for this great Christmas gift!