We're just getting started
Seth Godin, author of "Purple Cow" and a first class new media/marketing guru, says here and here that the internet is just getting started as a business, technological and cultural phenomena. Meaning we haven't seen anything yet. More to the point because of the expansion of broadband and falling storage costs plus access to standardized programming tools allows someone who has an idea to build it cheap and fast.
However, Godin cautions that precisely because of these trends more people than ever are doing it. For you, that means fierce competition. To become a Purple Cow the criteria must include relentless execution, knowing what not to do, being three steps ahead, and ignoring the pundits, including himself!!