Blog and SEO Writing

The Web has contributed to an evolution of our written and spoken language, adding to the language and its flexibility. Is it Web site, Website, Web-site, web-site, web site, or website? Some grammar wonks would say Web should be capitalized because it is the shortened form of the proper noun "World Wide Web"; others would say that all variations are correct as long as the use is consistent.  This is the flexibility of our changing language.