I spent my lunch hour yesterday transferring 3000 pages of Radiology text to my ipad as the first series of me getting my entire textbook collection into my ipad. Now the hard part was to find something to read it with. I purchased Goodreader and found it to be quite crappy, I'm not sure why so many of you liked it. It has not annotating features at all, and it loads the pages up super super slowly. Enter iAnnotate. It renders pages quickly. It annotates, and not just annotates, but has highlight, strikethrough, you can draw shapes, underline, etc etc. It also has an awesome UI where you can make your own toolbars. It has a lock feature so you can only scroll up and down, so you can zoom exactly how you want, then lock it in. It has full screen mode. Overall it is almost perfect, the only thing missing is night time mode where the text and background reverse, I'm going to email the dev and ask for this. So any of you with printed material you want to put in the ipad this seems like the way to go.