The two vim add-ons I have personally seen mentioned most have been perl-support.vim and taglist.vim. The former includes a number of short-cut/predefined key combinations for doing things such as syntax checks and running perltidy on code, while the latter works with ctags to allow you to move between functions and their definitions (even across files) easily.
Since you mentioned you were still somewhat new to Vim/gVim, I'll include a few links I find useful below. I have a few more links I can include as well, if you are interested.
Hope that helps.