Earlier this month, in my comparison of Documents to Go and Quickoffice, I noted that it is difficult to compare the features of the two apps because it seems that every few weeks, one of the apps is being updated. Yesterday, DataViz updated Documents to Go to add new features.
First, DataViz addressed the one major shortcoming of Documents to Go compared to Quickoffice, the ability to change the font and font size. With this change, Documents to Go now contains all of the text editing features of Quickoffice. (Quickoffice lags behind Documents to Go, lacking the ability to handle underlining and footnotes.)
You can also now add (or remove) an indent to the first line of each paragraph:
Finally, Documents to Go now includes the iPhone 3.0 shake to undo feature, plus you can now send files on your iPhone using accounts other than Exchange accounts (such as Gmail and Yahoo e-mail accounts). If you want to view attachments to e-mails in your inbox, however, you can still only do this with Exchange accounts. (Quickoffice, by comparison, doesn't let you directly access e-mail attachments from any account, but it does allow you to send an e-mail from any account to a specific e-mail address which sends the attached file to the Quickoffice server, from which you can then download the file into the Quickoffice app.)
Documents to Go still lacks the ability to edit Microsoft Excel files, but DataViz says that this is coming in the next update, which will be free for current users.