"Dirty Harry Potter" is probably one of the best of the bunch in terms of how well it's done. I have to give props to "A Hard Day's Nightmare" for the same reason. Very, very well done.
Probably the best laughs I had were "Lilo & Shaft", "2001 Dalmations", "Interview with the Monkey", and "The Sound of Twister" (all the way down at the bottom).
Honorable mentions for "The Last Temptation of Ernest", "The Princess Bride of Frankenstein", "Raiders of the Holy Grail", and "Platoontown".
Now, what is it with the Fark people and Ackbar, the octopus-like thing from Star Wars?