Zappos - A Great Online Shoestore
I found Zappos online shoestore when I was looking for Minnetonka moccassins, which are very difficult to find in stores. Zappos has free shipping both ways, so buying the wrong size is never a problem. They have a great fitting chart, and the shoes are priced well. Huge selection without running to 2 or 3 malls. (check out the moccassins!)
I've known about Zappos, but have only recently started using the site. In a word, it's Amazing! First, the selection is fantastic. I love the multi-views of the shoes, the reviews are super helpful for choosing sizes, and they have the bizarrely wonderful "free overnight shipping" option. (Shipping is free both ways, actually). I'm not even a shoe hound, but I've picked up three pairs of shoes on Zappos this week, and I've loved every single one.
Zappos also ships within 24 hours!