Startup ideas are essentially worthless. Paul Graham sums it up best in his essay Ideas for Startups.

"Actually, startup ideas are not million dollar ideas, and here's an experiment you can try to prove it: just try to sell one. Nothing evolves faster than markets. The fact that there's no market for startup ideas suggests there's no demand. Which means, in the narrow sense of the word, that startup ideas are worthless."

Because I believe this is true, and for many other reasons explained below, I'd like to give you some of my ideas, free for the taking, starting with this one.

Why would you do this?

You can't solve all of the problems
If you're anything like me, you have more ideas than you have time and caffeine. Work on the thing that you're most passionate and excited about, someone else out there might be really enthusiastic about building something related to your idea.

The idea solves a problem for you anyways
By focusing on ideas that solve actual problems you face, you still win if somebody builds it.

Early feedback
When I have an idea, I add it to a huge idea list, then tell as many people about it that'll be willing to listen and provide feedback. Even better if those people are potential customers. This acts as a quick sanity filter for ideas.

Finding co-founders
Talking about your ideas is the first step toward finding people who have complimentary skills, who are also excited about your ideas.

Improve your pitching skills
Telling your ideas to anyone who will listen gives you a chance to practice your pitching skills. Even if you never act on any of the ideas, you'll get better at expressing ideas. This is a very important skill for entrepreneurs.

Ideas are not unique
Speaking from my own experience, it's highly likely that somebody is working on your idea right now, or the product already exists in some form. 

Sharing ideas publicly isn't unique either. Damon Clinkscales has been sharing his ideas on his blog, which I encourage you to check out.

Not everyone will feel comfortable about sharing ideas publicly, and there may be good reasons for that. I highly recommend at least sharing them privately the with people you trust aka. the FriendDA. I'm lucky to have some very smart friends to bounce ideas off of. If you've got an idea you'd like some quick feedback on, the best way to reach me is here in the comments or via twitter: @benbinary.