Nice update to PDF Expert, my favorite PDF reader for iOS, released by Readdle today. Version 5.1 adds continuous scrolling, improved annotations, and Universal support with an iPhone app. I like how Readdle ported PDF Expert 5 to the smaller screen, and switching between multiple open documents is faster as well.
You can read my original review of PDF Expert 5 here, and get version 5.1 on the App Store.