This is a very exciting post. Google has just launched a mobile version of Google Docs, available at docs.google.com/m. It's not perfect, by any stretch of the imagination, but it's there. You can view documents or spreadsheets, but not edit them. And apparently, on an iPhone, you can view presentations, too. At present, they only support iPhones and BlackBerries, though, but more support is coming.
Check it out! I will use this all the time. I am constantly wishing I could view my documents while on the go...this is huge. I can't wait for the service to improve!