One of the more annoying issues with iOS devices is moving files to and from the device, but one of the best original iPad apps (also available for iPhone and iPod touch), GoodReader, helps to solve that problem with a new document sync feature.
GoodReader can now sync with the Dropbox, iDisk and SugarSync services, plus any WebDAV or FTP server. It handles a bunch of different types of documents (pdf, .txt, .doc, html, images, audio/video files, and iWork files). Setting up sync is as simple as adding a location and pressing the sync button. If you're having trouble keeping the most recent copies of your files updated, GoodReader is a great way to solve that problem.
The update is available now in the iTunes App Store. It's free for current owners of the app.