For All "Intents and Purposes" -- not "Intensive Purposes"
This one always gets me. I was watching a webcast yesterday, and the presenter (mis)used this phrase far too often! In light of this, I though I'd share some links to more on this "phrase".
http://www.urbandictionary.com/define.php?term=For+all+intensive+purposes
http://www.yourdictionary.com/library/mispron.html (Look under F)
http://www.wsu.edu/~brians/errors/intensive.html
Sorry for the OT, just had to get this off my chest!