Re: "Submit Your Project and Win!" Contest details and qualificaitons
I believe if you make an idea public, then yes, I think it would be up for grabs. But that would be a really crappy thing for somebody to do. Depending on the type, patents don't come cheap either though.
If you are certain that the project you built can be marketed into a product and make the person owning it enough profit to pay off the patent fee within the first year or two, then I wouldn't suggest posting about it. Just remember though, most technology is outdated in about a year or two anyways.
food for though
�In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed� - Charles Darwin