Just stumbled on this little app, and I think I've found the ALMOST perfect PDF annotation tool. Turns pages like iBooks, great highlighting and sticky note features, and very fast rendering of PDF images. Only couple of negatives to it is that you cannot yet view annotations in a bookmark-like drop down table; you can't choose the highlight color before you highlight, only after; you can't delete or add pages to a single pdf (as far as I can tell); and the handwriting feature leaves a lot to be desired. But on a scale of 1 - 10, I give this a very solid 9. And I've tried pretty much everything you can think of as far as pdf annotation apps go. I think I have about 13 of them on my iPad, many of which will now be deleted. A future update will also include text-to-speech and text reflow, just FYI. I hope the annotations view feature and highlight-color issue get fixed soon, too.