I absolutely hate the way autocorrect works, it is exactly backwards from what I would expect. I'm pretty sure I know better what I am trying to say than the device is, but Apple doesn't think so.

One of the most bizarre autocorrects that I've seen was a friend typing 'killshots' and his iPhone autocorrecting it to 'lullabies'.

At least they gave me back the hardswitch rotation lock in 4.3 for the iPad. That was worth the pain to deal with iTunes for the upgrade right there.