Zoho’s online office suite apps, Zoho Writer, Zoho Sheet & Zoho Show got extensively reviewed by Jake Ludington’s MediaBlab. From the review :

Many companies have tried with limited success to take on Microsoft Office. … Recently a number of Web apps have been appointed the “MS Office killers” for various reasons. I think the demise of Microsoft’s cash cow is greatly over exaggerated , but the online versions succeed in usability where their downloadable counterparts have failed at providing a highly usable experience . My favorite of this category is Zoho Office Suite, which includes a spreadsheet, word processor and basic presentation maker.

If you need most of the features of Microsoft Word, but it isn’t on your computer or simply isn’t in your budget, you could download one of those bulky free Office Suites, like OpenOffice or Software 602, but there’s an easier solution. Zoho Writer is a browser-based word processing application with every feature I typically use in Microsoft Word.

Zoho Sheet is perfect for light duty spreadsheet usage. It does all the basic spreadsheet calculations. Zoho Sheet imports data from existing Excel and OpenOffice Calc files as well as CSV files. Like Zoho Writer you can either work in a mode that requires no login or create an account to maintain a set of online spreadsheet files.

Like PowerPoint, Zoho Show creates slide decks for presentations. From adding graphics and text, to adding timed transitions, Zoho Show will do basic presentation tasks. … , Zoho Show is quick and easy to use – and if you’ve got an Internet connection, you never need to worry about not being able to access your presentation from any machine with Firefox or Internet Explorer.

And Jake pointed out about the various Zoho applications requiring signing up for each
one separately & Zoho Show’s lack of audio/video support. We will addressing them soon. Thanks Jake, for the wonderful review!