I love reading books on my iPad. I really dislike iTunes. I’ve avoided using iTunes to get content onto the iPad using Goodreader since it has Dropbox integration. But I really like using the iBooks app. After some poking around in Dropbox I found I can now get PDF’s into iBooks directly without syncing with iTunes.
Open Dropbox and navigate to the PDF you want. Open the PDF and click the little rectangle box with the arrow in the upper right corner. One of the options is iBooks. This transfers the PDF from Dropbox to iBooks!