I use my smartphone for more than just phone calls and data is king on my devices. Today Google rolled out support for editing Google Docs on the go through your smartphone. You simply point your browser to docs.google.com on a supported device (Android with 2.2 and iOS 3.0+) and select the document you wish to edit. The video below shows how it works.
Google also pointed out in their post that they supported spreadsheets from your mobile browser way back in 2009.