There is Gonzui, which indexes all of CPAN and which is very convenient to have when scanning for certain constructs of code or module usage. I have the following as a browser "keyword" which allows me to search from the browser bar:

http://cpansearch.bulknews.net/search?q=%s&fm=all

[download]

Additionally, you can use the CPANTS database, which also lists the prerequisites I think.

In reply to Re: Searching CPAN for instances of dependencies on a module by Corion
in thread Searching CPAN for instances of dependencies on a module by jkeenan1

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