They idea is not worth much in the sense that if you thought of it, there is a 98% chance someone else has thought of it before you, and 95% chance a few others are already doing it. The remaining few percents on both cases determine that the idea is not worth much. Great ideas with done badly can succeed, but those successes are usually short term and fade away, in particular when someone else copies the idea and does it better. Ideas are a dime a dozen. Really. Not that hard to come up with them. Coming through with one to a launch and running a business with it - that's the hard part.
Find an industry you are familiar with, or perhaps a friend or family member. Find their pain points. Find how technology can help. Then see if it is something that they will pay for. Look around your daily life. Find problems to fix. Most likely someone else is already fixing them and if not, they will once you start if your idea is good enough.
Two ideas for you off the top of my head:
Do CRM right for SMBs. (Sounds simple, but it's not, because of the S and the M in SMB).
Do time tracking right (timesheet management for contractors etc.). Never saw a single solution that didn't suck to the extreme.
Bonus tip:
Here's a thing though: non techies won't have the advantage a technical person (i.e., adventurous software developer) has: The tech can do it with minimal resources and overheads. If you also have a business sense - that's great. Otherwise break existing market by offering a superior service dirt cheap (but not free!). Once you reach a critical mass, grandfather the existing accounts in their original early bird price and nudge the cost for new customers up a bit. Automate as much as you can and you have a side income with potential to be main income.
