Several group users have mentioned that the new forms feature would be more useful for data entry if it didn't redirect to a "Thank You For Your Submission" page.  Well, you've got it.  The original cowbell example that showed how to embed a form in any web page has been updated to hide the redirection page!  See:

Cowbells Without Retakes

Comment: Nice idea, but is using the forms feature this way officially supported by Google? I would hate to set this up for my business, say, and then have them change the way it works on me so that my online data collection form no longer works...

Good Point:  So far so good.  I've seen usage of this concept grow, and Google seems to be interested in it.  I don't think I'd base a business plan on it just yet though.