Using Camera+ now feels just like a real camera. Your photos can be sharper because you can now hold your iPhone steadier with two hands instead of fumbling around for the shutter button on screen.
Just when I thought Camera+ couldn't get any better, they (attempt to) give me the one thing I want most (especially in light of the iPhone 4's perfect volume buttons). (I say "attempt to" because the update still hasn't been approved. Fingers are crossed.)