gitorious is a pretty good FOSS alternative to github. It doesn't support private repositories at all, but you can host your own server and make it not public (which is what I'm doing for my projects).
.. and then I realised, github does all this for me, and for $50/m or something for an org account, and that is an absolute no brainer for a working professional. I cannot fathom these complaints about $22/m or what not. If you have enough knowledge to participate on HN and that amount of money is meaningful to you, you're doing something wrong.
I already had a server setup with redmine and some other internal services that I needed, so the added overhead for backups and so forth was pretty minimal.
I also want to keep control over any privileged client data and not trust them to "the cloud".
For sharing repos I grant people access to the corresponding redmine project (I have a script set up that make accessing things from there trivial, and redmine has support for private projects).
But yes. $50/month is really very cheap and if I didn't have my privacy concerns with github, and the problem of integrating it with my other services, I would probably use that.
Anyway YMMV but out of all the outsourcing decisions I've had to make recently, github was one of the easiest.