Infopath 2007 brings the new feature of rendering the infopath documents in the browser. However this feature can be slightly confusing for the beginners. When MOSS 2007 beta 2 was released I took me 2 days to find out how to render your own infopath document to browser.
The steps for this are below:
§ Complete the publishing wizard (using the SharePoint option) and publish the form to a shared location
§ Launch the SharePoint Central Admin page
§ Select Application Management
§ From the InfoPath Forms Services section select Manage Form Templates