At WWDC, Steve Jobs announced that an update to iBooks would appear sometime this month. The update would bring complete PDF support to iBooks and users could read their PDF’s within iBooks itself. The PDF’s would be featured in the books shelf just as the books downloaded from the iBooks Store do. The App would now have two sections on the top – Books and PDF
The App would even add notes and bookmarks which would let you take quick notes while reading a book or PDF and bookmark any page.