One can not succeed if there is no market
The demise of Kiko generated a lot of traffic in the blogosphere. Kiko’s calendar may be a cool product, but it cannot succeed if there is no market for it.
Online calendar for consumers is a tough market. Kiko may have had a better shot if they focused on businesses and organizations, e.g., providing a hosted calendar serivce for schools, clubs and small business owners. Trumba realized that quite a while ago and changed their focus to the business market.