iAnnotate PDF for iPhone, iPod touch, and iPad on the iTunes App Store

iAnnotate PDF for iPhone, iPod touch, and iPad on the iTunes App Store: "I am a scientist, and I read and review dozens of journal articles each year - I love that I now am carrying my entire library of journals everywhere on the iPad in iAnnotate. iAnnotate is currently the only app that allows me to markup, comment, and highlight (along with copy/paste) PDF files, and it does those things quite well. The UI is a tad unintuitive, but there are hints that pop up the first time you use each tool. The mechanism for uploading files to the iPad is a bit cumbersome, but I expect that better syncing will be coming along shortly now that the iPad is on the street."