Writely - Word Processor on the Web

The web allows you to do plenty of things. I've mentioned that you can edit photos and images using a web-based image editing tool called PXB8.COM. Now you can even do editing of documents on a web-based platform. Writely is a web-based word processor that you can use to do your text editing. You do have to sign up before you can start working on your novel online. With text and images covered, will we soon get a web-based Excel?