This is an interesting point, I think the tendency of most people who are creative/idea types (myself included) are kind of an over thinking of their own ideas, like they are somehow more important and prone to "theft", but the more I work on my own stuff, and the more I do on in open source, the less and less I think that’s the case.
Like when I was working on Capsulr (http://capsulr.com/, shameless plug), I worried about showing people stuff too early, until I just realized that most people probably wouldn’t even see the site, or if they did, most wouldn't even see the product the same way that I see it evolving. It’s kind of helped me to start documenting my work, and I find that sharing notes publicly (just with myself) is a load of pressure off my shoulders and is worth the tiny possibility that someone might take it and run with it.
Like when I was working on Capsulr (http://capsulr.com/, shameless plug), I worried about showing people stuff too early, until I just realized that most people probably wouldn’t even see the site, or if they did, most wouldn't even see the product the same way that I see it evolving. It’s kind of helped me to start documenting my work, and I find that sharing notes publicly (just with myself) is a load of pressure off my shoulders and is worth the tiny possibility that someone might take it and run with it.