For our first web-based product we (Austhink software) decided to go straight for integration with the web-based Salesforce CRM, and put it up on Salesfore.com's AppExchange marketplace.<p>We've only just got it up there, but I thought that our experience may be of interest to those looking to play in the "Enterprise 2.0" (i.e. cloud-based, single-sign-on, Saas, mashed-together apps) space.