As OpenSim becomes more stable, many people are looking into developing new businesses on top of it. That is great! An ecosystem of businesses is exactly what we want to happen, if OpenSim is to fulfill its potential. However, let me add a word of caution in the form of a personal plea regarding doing businesses on top of OpenSim: be careful with what you patent, or you may put yourself out of your business before you even create it by placing obstacles on the way of the infrastructure.