Well earlier Bush did it discretely. Its nothing new. Only this open declaration shows disrespect to sovereignty of another country. Pakistani Foreign Ministry spokesman termed it "irresponsible".
Update: Kush Tandon comments in Sepia Mutiny:
I think Obama is being highly irresponsible. I do not think you do a "damn thing" on Pakistan's territory without their yes/ permission. Pakistan is not a banana republic, even though it has serious complications.Pakistan is outraged over it. There was even a round table discussion on Pakistan television about the impending US attack: Part 1, Part 2, & Part 3 available in YouTube.