Register a .com domain over a .biz or .us domain

Trying to find a good domain name can be challenging, especially on the .com top-level domain (TLD). But finding a good .com domain will rank higher than a similar domain on the .biz or .us TLDs. And if you can get a .edu domain (because you're a school or university) your site will have more credibility instantly. Some SEO services feel that a .org TLD is better than a .com, but they aren't any more difficult (in general) to get than a .com domain, and while search engines might give them some priority now, they will probably lessen that as .org domains become more common.