Google Docs & Spreadsheets
There are a lot of really cool things about having your documents available at all times, and not restricted to your own personal hard drive. The ability to upload and open up the document to collaborative work is also very neat. I think it would be great for kids doing collaborative school projects or something like that. I found the whole site very easy to navigate, simple to start up a new document and begin typing or manipulate your text.
PS: I like the fish so i'll just leave them there for your enjoyment! :)