Readdle has updated its ReaddleDocs document reader for the iPhone and iPod touch adding support for two-way synchronization with popular cloud storage services and a new PDF engine. ReaddleDocs 2.3 now allows users to synchronize their files automatically between services such as Readdle Storage, Dropbox, MobileMe, SugarSync or any other WebDAV server. The new version also adds support for accessing files on FTP and SFTP servers and a new PDF engine with smoother scrolling and the ability to view PDF annotations. Other improvements include the addition of AirPrint support and the ability to save webpages to PDF files on iOS 4.2 or later. MP3 audio files can now continue playing using background audio and a night mode has been added to the document viewers. ReaddleDocs is available from the App Store for $5. An iPad version is sold separately.