I had that idea...

It is a horrible feeling, someone gets rich or famous on the great idea you had years ago. Do you have something brilliant you are working on? You need to get it out there and let people know.  That half written book, the blog you started with a few postings but no traffic, the business plan sketched out in your notebook, find a way to finish and announce it.  When you finish, make sure you announce it boldly.  Creating brilliance and not letting people know is worse than coming up with an idea and never working on it.  Why? Because you put the effort in to developing the product, writing the book, posting to a blog, but your fear of letting people know means just as many people benefit from your work as if you had done no work on it at all.  Zero.  Wasted time, wasted energy, time that could have been spent with friends, family, etc...

If you don't speak about your work, no one will.  If you aren't producing work that you want to speak about, then stop producing it.