For a recent conference, I took my iPad instead of a laptop for the first time. While it lessened the burden on my back, the overall benefit was equivocal. The most prominent problem was the lack of easy way to take down notes on powerpoint presentation materials. With a laptop, I'd just run Powerpoint and take down notes in the notes section. With an iPad, I had to convert the slides into PDF files (so the Good Reader can edit it), open it in Good reader and make notes as annotations. But making annotations with Good Reader was not as speedy and convenient as taking notes with a laptop. With tens of thousands of apps out there, I'm suspecting there must be a better app out there that can help me out in this situation. Any recommendation?