Here is a dirt simple one that just loads up the source of a perl module in vi. It is a shell script, but if you really wanted to, could be re-written in perl...

#!/bin/sh

DOC=`perldoc -l $1`

if [ -n "$DOC" ] && [ -f "$DOC" ]; then
    vim $DOC
fi
[download]

I got tired of writing vi `perldoc -l <module-name>`, and thought pvi <module-name> saved me some key strokes.