Embperl_Syntax.zip is a project mainly written in Vim Script, it's free.
Syntax for Embperl
This is a mirror of http://www.vim.org/scripts/script.php?script_id=61
Rewrite of the official embperl syntax file. There is a color scheme for setting GUI like Interdev (yellow perl code).
This is "beta" version of the script. It needs more testing (in vim < 6.0).