By far, this is my favorite example of a shopping cart. It's easy to follow and the bare minimum of information that they need to place your order. I also like that the cart slides out and doesn't take you to a seperate page or window. You can always see the last step/form.
Simple and what you'd expect. Is that bad though? Not really. The process is still fast, easy to understand, and simple. I also like the simple design.
Another slide out, but this one doesn't have as many layers. It only slides once and then brings you to a new window. I do really like how you can "save your information for the next time."
I figured I'd check out a very popular shopping store to see how they do it. I thought, "If it got so popular it must be doing it right, right?" The layout here is pretty simple and nothing new. It's pretty basic but effective.
This one is similar to my first find but not quite the same. It's still a slide out but the information isn't orginized as nicely. I like the fact you can pay with paypal, and again- it asks for the bare minimum.