[profquail]

That's a very good point to make.

.NET developers, you can set up a similar cache for NuGet packages to avoid downtime (and reduce bandwidth usage): http://www.hanselman.com/blog/HowToAccessNuGetWhenNuGetorgIs...

[kawsper]

Is bandwidth usage really a concern?

[profquail]

For most people/enterprises, no. But there are still many places in the world -- in the US, even -- with slow and/or spotty internet connections, so it would make sense for them.