A little googling says Bret Jacobson is a libertarian. I'm guessing he's a Republican because they have a snowball's chance of winning elections. I kind of hope there are many more like him. More dissent in the Republican party means the Democrats are at less of a disadvantage for having a more heterogeneous base.
Libertarian has become meaningless in a modern political context it sometimes means socially moderate republican but most of the time it just means republican.
A lot of people who identify as being Libertarian have no idea what it actually means. They take the most common definition that is currently thrown about (socially liberal, fiscally conservative) and apply it to themselves. I would love to hear what they really think about libertarian ideas and literature.
I fall into the left-libertarian/Situationist camp most of the time but I am politically promiscuous when it comes to friendships. I used to be able to find common ground with Right-Libertarians on issues such as racism, war and civil rights. Now a days not so much. Glenn Beck calls himself a libertarian. I am not a fan of classic libertarianism but it is a bit sad when a word completely loses its meaning.