Is it weird to go to a bar alone?

There's actually three questions in here, so please read the whole thing:

I'm sort of new in town and would like to meet some girls, but don't really have any guy friends to go to bars with.

So, if I go alone, what exactly should I do while I'm waiting for the opportunity to talk to someone? I don't go to bars much...

Also, extended question for girls: If you go to a bar with a few girls and see a guy by himself, does having your friends with you deter you from approaching the guy?
Is it weird to go to a bar alone?
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