I don't do anything once I have the initial idea. I let it sit around in my head for a few days/ weeks... If it keeps bothering me then I try and get the core

I don't do anything once I have the initial idea. I let it sit around in my head for a few days/ weeks... If it keeps bothering me then I try and get the core of the functionality down as quickly as possible - I get something online which I show my friends and family. Once I've taken, or not taken, their advice I move forward. I push forward a bit with my gut feeling and get my girlfriend to work on the design. (She's an awesome designer, I'm really lucky!) I flesh it out around the edges, user registration, 404, 500 error pages whilst I'm waiting for the designs. (Or I just work on something else.) And then I'm in "beta."