Is there a way to host a Infopath 2003 form in a web browser? I can't afford 2007 or sharepoint server or 2003 server to put it on, and am wondering if there is a way to view a 2003 form in the browser...
You will need InfoPath 2007 and MOSS to do this.
There are some after-market products which allow you to do what you are talking about, but some functionality will be lost.
For example, Qdabra's DBXL comes with a Forms Viewer service which allows visualizing simple forms - I believe it is available in the free lite version available for evaluation: http://www.infopathdev.com/files/folders/dbxldownload/entry22386.aspx