I've been working with Google's Docs & Spreadsheets web pages, which allows you to create documents and spreadsheets, and save them in various formats. The other nice feature is that you can publish to your blog. So you can have the features of a word processor without having to actually starting Word, or such.
It also allows you to collaborate with others on documents and spreadsheets. I've been putting some Emmaus docs in here so that I can get to the information from multiple computers.