After installing 1.1.3 and all that goodness, everyone I’ve talked to has the error when downloading some packages from Installer. This is due to Conceited software moving a repository.
You need to install Community Sources 2.5 or newer to fix this. However, you may not be able to because you are getting the same error when trying to install Community Sources. Just go to Sources, remove Conceited, refresh, Clear the Installer Queue, then re-install Community Sources. voila!