Not an ebook reader per se, but goodreader on iOS is by far the best pdf note taking app around. Not only does it have a gamut of styles of highlighting, but th

Not an ebook reader per se, but goodreader on iOS is by far the best pdf note taking app around. Not only does it have a gamut of styles of highlighting, but then you can export the whole mess and it makes for a wonderful synopsis of a book, complete with page references.