How about linking to the project web page or the official blog where

the move was announced when available? I think that's how it's done on

the mercurial page. And it explains people why the switch was done

rather then linking to a source repository they might not care about

and the link to the project page might give a hint about the

importance of the given project for those that might not know it (such

as prototype, mootools or liftweb).
example:

http://weblog.rubyonrails.org/2008/4/2/rails-is-moving-from-svn-to-git

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