QuickOffice and Box.net both announced updates recently that work together to provide more seamless access to documents on your iPhone, from the cloud.
QuickOffice 3.0 [$9.99 - iTunes link] lets you access documents stored on Box.net, as well as other cloud-based repositories like MobileMe, Google Docs, and Dropbox. It's also a free update for existing users.
Box.net has [Free - iTunes link] also released a new version that includes collaborative comments, the QuickOffice integration mentioned above, and new API's for developers to connect up search, commenting, and activity tracking in other apps as well. Requires a Box.net account, but you can get 1GB free online.
If you try out either, or both, let us know what you think!