When the list of accepted talks for PyCon 2009 was released, it wasn't the whole story in terms of scheduled content. This year the program committee decided to do something different and have invited talks. Now, short of the keynotes which have not been announced, people have a very clear picture of the great content that is set to be shown at PyCon this year.
[Full disclosure: I am on the PyCon program committee as well as an invited speaker, although I didn't know I was invited until I got the invitation =) ]
