Not all ideas are good ideas so it is important to test an idea first before diving into full-on creation mode right away. The easiest way to test an idea is to simply ask your social networks what they think of the idea. When I began creating this e-play, I asked on Twitter, "Just finished putting together details for my play on creating passive revenue streams. Sound interesting?" I received many replies stating that it was of interest and people couldn't wait to read it.
Sometimes, you won't get an overwhelming response to something or maybe people will reply back with some clarifying questions or they will have a bit of hesitation around committing to the idea. This is usually a good indication that the product is just not ready to be developed at this time.
If you don't have a network to ask the question to, ask a few of your colleagues but make sure to ask people who will give you an honest reply.