Zoho celebrates 1,000,000 users

Zoho did a lot of things right: they created a brand by offering quality SaaS applications, they figured out the business model by providing a healthy doze of freebie applications and only charging when the customers are hooked and charging a "no-brainer" fee, they keep innovating and putting out new products frequently

I'd say they are the ones to beat for the web office for small business.

I also hope this graph is representative of the overall SaaS adoption rate.
Congratulations Zoho!