The end user MUST have INfopath 2003 installed in order to use yoru form. The form cannot be exported as a HTML form or anything else.
Forms cannot be re-used and if you make a change to yoru database structure, you MUST rebuild the form from scratch (sucks eh?).
Infopath does let you make simply data entry apps in a pure GUI fashion in a mere hour, but as you can see it has some severe shortcomings.
Hopefully MS can fill the database changes problem in the next version (almost makes you wonder if they did that on purpose to give us a reason to buy Office 2004).