Do you find yourself reading a lot of pdf documents? Email attachments, manuals, school documents, textbooks? I hate reading them on a computer, but I love reading them on an iPad.
Open pdfs in iBooks!
Open the file from your email or internet on your iPad, then go to the top right corner and select "open in iBooks".
I open all pdfs from email or websites that I might want to reference later in iBooks. I keep all my tech manuals there, too. You can even create collections to keep your pdf documents organized.
Bookmarks
Once in iBooks, select the icon next to the Library button

in the upper left hand corner. This will show you thumbnail images of all pages.
Now look at the upper right corner.