sfdc-web2anything
Long time no update. I know, I know..
We’ve launched an opensource project to help you generate web forms for the live collection/insertion of data in any standard or custom Salesforce.com object.

Although Salesforce.com Sites will soon be in Developer Preview, we thought that some Salesforce.com customers could find it useful.
Check the project website for details at Google Code: http://code.google.com/p/sfdc-web2anything/