Have you been thinking of launching a web based application, plugin, or tool? Well, Achtentachtig has created a list to help you walk through going from the idea to the launch. They give much more detail in their post, but here is the list for you.
5. Information architecture and wireframes
6. Design and Interaction guide
9. Invite beta testers
Check out their full post for more details behind each step of the process, and remember that if you work through it one step at a time, you will reach your goal.