Another running post, this one aims to collect information about using InfoPath to post browser-based forms on SharePoint 2007:

• This page suggests that it's possible to force browser-based display of forms within SharePoint, even if the InfoPath client is available. I think this is desirable behavior because it creates a consistent user experience and allows easier testing for the person deploying the form.
• The XmlFormView webpart appears to be another way to host forms in a SharePoint browser.
• Details on configuring an .aspx page to embed the XmlFormView control.
• A generic how-to jumping off point.
• More to come...