I have reviewed Zoho's Planner before on this website. Zoho also offers several other programs online, forming a full featured office suite. Zoho is pretty innovative, and this time they've come up with a tiny little plugin for your browser that allows you to view a document :

Install QuickRead and you can directly open documents, spreadsheets and presentations present on the web with Zoho! With Zoho QuickRead, downloading files to your computer & opening it with a desktop app becomes passé (Zoho Blog)

This feature will bring toe programs closer to the user I think. Well done, Zoho !