The Joomla! Forum™

Here is a mirror to the joomlacode.org downloads:

http://mirror.phil-taylor.com/

Still trying to find the migrator RC5 mirror.

I agree, there needs to be mirrors as a contigency plan - otherwise no new users will be brought to your project because it will never be available to them. Maybe you should either use more than one server, or perhaps use sourceforge to host the files.