If you want a parody unrelated to anime, check out the stuff by Joseph Blanchette at The Legendary Lilypad: Website News!
Hot Heads 2!!!!!!!!!! (I think it's called like that) It's soooo funny!!!!!! But it's a movie... One of the serious parodies.... This one was about all the war movies...
Lesly Nilsen is great too... though his newest movies get dumb...
And Monty Python... I think it was a parody too... At least "The Holy Grail"- it had even a part of Star Wars ^^ lol
My recommended fanfic: "Dreamer" by Scourge
I would have to go with Weird Al, those are truly funny.
his song about star wars gets me laughing time and time again.