This is relatively old news now, Google Documents and Spreadsheets has added the capability to do presentation slides and is rebranded simply as Google Docs. This completes the basic tools a office user needs: a word processor, a spreadsheet editor and a presentation maker. Below is a short introduction video produced by Google to introduce the features of Google Docs:
This resource is really useful IF everyone in the group knows the benefits of the collaborative features. I’ve tried recommending this a few times for various projects and it hasn’t been well received. I believe it’s most probably because the web applications feel crippled and sluggish compared to Microsoft Office. People are still more used to emailing each other updated versions of the same documents.