My understanding of it:

Gems is a packaging mechanism (similar to PPMs in a way; gems may contain extension code that's compiled on the installing system, or binaries for Win32, or pure Ruby code). rubyforge.org is a Ruby-oriented Sourceforge-y site and the default source for gems (similar to how AS provides the default PPM repository), but the gem utility may be pointed at other servers (for beta releases, private repositories, etc). RAA provides a general index of Ruby projects with pointers to where they live (so similar to CPAN but nothing's really available directly from it; you get pointed to rubyforge or the author's site).

In reply to Re^2: CPAN and RAA by Fletch
in thread CPAN and RAA by hsmyers

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