Google has finished integration writely (the web-based word processor, that was recently acquired by google).The plus is that now you can see, both, your spreadsheets and documents in the same view. Brilliant!
See: Google Docs & Spreadsheets
Update: I tried using Zohosheet.com. It has a cool feature which lets you embed sheets directly into web pages. See below
And no! Thats not just a screenshot. Its fully usable. Click in it and try moving about - pretty Cool eh? Is Google looking?