Where are plug ins located? (mac)?

I have some cool plugins on my mac (like its shows the album art over my iTunes icon when it plays & and a pause/play button in my menu bar). i am about to purchase a laptop and i want these same features, but i dont remember their names or where i got em, and i dont know where to find them on my personal….

please help

For finding the original (or updated) versions, a good first step might be to look for the plugins you want here: http://itunes.pluginsworld.com/index.php…

I'd also recommend checking these out: http://dougscripts.com/itunes/

There's always Google, too.