I disagree with you there general-marty, I think the primary factor determining your success on the web is a decent business plan and marketing strategy. Without that you rely on free traffic from Google. Any company that puts all its eggs in one basket (e.g. Google Organic) is skating on thin ice.
I got the IP address URLs - those are usually staging servers, I also was going to mention tracking parameters with Google Analytics as an example, but it really isn't that common.
Definitely should have added the slash vs no slash one though, will add later, feel free to add them yourself if you like ;)