Direct link to all projects+description page: http://twitter.com/about/opensource

I love the pedigree of open source apps. Facebook made cassandra, thrift, and scribe. Twitter uses all three.

It makes the competition less about technical know-how and more about product. Awesome.

Direct link: http://github.com/twitter

edit, this is just one of several of their accounts

...is GitHub 'on github'?

Of course http://github.com/github (admittedly, much of our OSS contributions are split between our personal accounts)

maybe a feature that will aggregate all repos under one company namespace?

There are links to each Githubbers profile on the blog ( in the right hand column):

http://github.com/blog

Apparently that is coming soon, but they've been saying that for months.