Today I'm trying to read some documentation for ruby gems I haven't installed. In perl, you can just go to http://search.cpan.org/ and read documentation for all kinds of things you haven't installed and evaluate whether you want to read more or download or install.
Have you used the perl introspection module Devel::Spy before? No? Probably not. You can trivially go read the documentation for this thing you've never heard of at http://search.cpan.org/dist/Devel-Spy.
Not so with RubyForge. It's missing the batteries, you see.