This week’s must-have iOS apps features a new application that allows you to have free, high quality video calls over both Wi-Fi and 3G. Tango Video Calls is free a application to download, and works on other smartphones as well as the iPhone.
PDF Expert for iPad is Readdle’s latest application that delivers the ultimate solution for all your PDF needs on your iPad. It lets you read and annotate PDF documents, highlight text and make notes. You can also edit the documents you have stored on your Dropbox, iDisk, and Google Docs accounts.
PlainText is a free text editor compatible with all of your iOS devices that uses your Dropbox account to save your work. It has a paper-like interface that provides a nice, simple feel, and it’s a great substitute to iOS’s built-in Notes app.