.Net is an excellent platform for startups due to its speed, flexibility, and low costs. The document outlines four steps for launching a startup using .Net: 1) Sign up for Microsoft's BizSpark program to get free software, 2) Design mockups using Balsamiq Mockups, 3) Publish a marketing website using cheap options like 99designs and Discount ASP, and 4) Build a minimum viable product using ASP.Net MVC and cloud hosting from Rackspace. The document also discusses the active startup community and resources in Boulder and Denver.