"I still have mixed feelings about the open-source movement, mainly because its most popular component, Linux, is offered by over 100 vendors, each of whom has a slightly different product. Other than Linux, all the other open-source projects move along at a rate best described as glacial. Even principals in the community are sometimes shocked at the slowness of open-source development. This probably is a function of how motivation and lack of fear work among open-source developers. Often they're motivated like hobbyists. And there is no fear to drive anyone to do anything---no fear of getting fired or yelled at by a mean boss."
In this nice article by John C Dvorak, he talks about the current state of open source, where Linux is going, what kind of threat Linux might be to Microsoft and whether its worth any of us bothering with open source at all.