This module does one thing: Finds URIs and URLs in plain text. It finds
them quickly and it finds them *all* (or what URI::URL considers a URI to
be.) It only finds URIs which include a scheme (http:// or the like), for
something a bit less strict have a look at URI::Find::Schemeless.

For a command-line interface, see Darren Chamberlain's 'urifind' script.
It's available from his CPAN directory:

http://www.cpan.org/authors/id/D/DA/DARREN/