Documents To Go alternatives

Documents To Go
Documents To Go is an all-in-one application with support for Microsoft® Word, Excel & PowerPoint, PDF, Apple iWork and other files and attachments. It includes a desktop application (Win and Mac) to provide 2-way file synchronization and a version with support for Google Docs, Box.net, Dropbox, iDisk and SugarSync is also available.
Documents To Go alternatives are:
Google Docs
Here are the latest news about Documents To Go:

2010 QuickOffice and Documents To Go allow to edit Word, Excel and PowerPoint on the iPad

QuickOffice iPad
When the iPad appeared earlier this early, one of the major problems the business users faced was that the tablet didn't allowed to work normally with office documents - Word, Excel and PowerPoint. The Apple's own mobile office suite iWork only allows to view MS Office documents on the iPad and doesn't allow to edit them. But now this drawback is fixed. The most popular mobile office suites QuickOffice and Documents To Go almost simultaneously launched the versions for the iPad. Both solutions are paid: Documents To Go costs $10 for the standard version and $15 - for the premium (it includes additional cloud file storage) and Quickoffice - $10. Both packages allow basic editing of Word, Excel and PowerPoint documents on the tablet. QuickOffice doesn't provide the cloud-sync option, but it works more stable.