Adobe has released its own version of Reader for iOS devices including the iPad and the iPhone. There are already a lot of pdf reading products out there including, Goodreader and iAnnotate PDF. Some of these allow you to make notes and changes. Adobe’s Reader basically just allows you to view PDFS, but it is the fastest app I have used to do so.
Pros: Superfast, Clean, and Easy to Use.
Cons: No Bookmarks, notes or markup.
Maybe Adobe Plans on coming out with a Pro paid version of this app, just like its desktop products.