Virtual communities like open source software groups or other virtual organizations have an inherent problem with leadership. The main reason is that it's not so easy for somebody to lead unless others see him talk in person. Charismatic leaders build consensus by convincing others partly because they present strong arguments, but also because people like to watch them talk as they are effective public speakers and often of above average looks.
In a virtual community most of that body language, charisma and good looks disappears in asynchronous, e-mail based communication. So for a person to lead a virtual community effectively, he has to be super knowledgeable on the subject and have lots credit to his name. Like Linus does or.. like.. Vint Cerf or, dunno some other famous tech person.
So ..yeah, it's hard.