Office Web Apps has been available for Windows Mobile devices, iPhone, BlackBerry

At this time public beta version of Office Web Apps has been available. According to Microsoft representatives, there are two ways to access the Office 2010 applications, that is via the Office Web Apps and Office Mobile 2010. Both can be accessed and downloaded freely.
Office Web Apps are a few browsers support the following:
* IE on Windows Mobile 5/6/6.1/6.5
* Safari4 on iPhone 3G / S
* BlackBerry 4.x and newer
* Siemens S60
* NetFront 3.4, 3.5 and newer
* Opera Mobile 8.65 and newer
* Openwave 6.2, 7.0 and newer
For the Office Web Apps, this support is to view Word documents, Excel, PowerPoint and OneNote. Users can not create or edit documents from the phone.