After spending alot of time in the SitePoint MarketPlace I realized that many of the crucial checks that need to be done when investigating a website, I have no idea how to do.
I would like to compile a checklist and explaination of things to look for when investigating a website / domain. This can either be when considering a purchase or just for fun.
Please post an item to the checklist that you feel is helpful when searching for information on a domain. What website or tool best works for you? What is a crucial point that you make sure is always looked into?