This is a little bit old, but google has an online spreadsheet service, which is pretty cool. I had to e-mail them and say that I was interested, and then they replied and I was able to use it. I guess it is another one of their services that may be in beta for the next 2 years. I expect that they will be offering some sort of word clone in the near future as well.
I think google can really make a dent in Microsoft’s cash cow (office), but they are going to really need to do some work on the privacy end of it. I don’t think that too many corporations are going to get into using the service if Google is parsing the documents, like they do with e-mail.