Internet and computer terms:
World Wide Web
Associated Press, in their Stylebook, still recommends "Web site," "Internet" and the absolutely absurd "e-mail." Oxford English Dictionary says otherwise. Common usage seems to agree. I've used their spelling above. In terms of hyphenated "e" words, like email, ecommerce, etc., use common sense. Common usage has eliminated the hyphen in many of those words. When in doubt, says the OED, hyphenate. Regardless, just be consistent. That's the most important thing.