Did you know that FCP can actually host AU plugins?
AU is one format of plugin that you can use in programs like Logic, Ableton, Fruity Loops etc.
I'd always wondered if video editors could host these plugins, I just found out that FCP has had that option since like version 6...
Here's a list of plugins for any FCP users, all of them are available on Mac and for free:
And here's a link to a good free Linear Phase EQ:
Oh, this also means you can host reverb plugins and such in your editor... Am I alone in thinking this is super cool or am I just late to the party?