I was just reading Paul Graham's post entitled The Kiko Affair which talks about the recent failure of Kiko, an AJAX web-calendaring application. I was quite surprised to see the following sentence in Paul Graham's post

The killer, unforseen by the Kikos and by us, was Google Calendar's integration with Gmail. The Kikos can't very well write their own Gmail to compete.

Integrating a calendaring application with an email application seems pretty obvious to me especially since the most popular usage of calendaring applications is using Outlook/Exchange to schedule meetings in corporate environments. What's surprising to me is how surprised people are that an idea that failed in 1990s will turn out any differently now because you sprinkle the AJAX magic pixie dust on it.

Kiko was a feature, not a full-fledged online destination let alone a viable business. There'll be a lot more entrants into the TechCrunch deadpool that are features masquerading as companies before the "Web 2.0" hype cycle runs its course.