For the benefit of those who haven't used it, Zoho is a web-based service that allows you to create office documents for free.
iZoho is designed to give you free access to these documents, although it won't let you edit them. Zoho is an excellent office suite, which is used entirely online and allows you to produce spreadsheets, text documents, databases, slideshows and emails.
iZoho is a special version for the iPhone and iPod Touch that allows you to read documents created in Zoho from wherever you are in the World. In fact, reading is about all you can do with your work in iZoho as it comes with no tools for changing or correcting documents. Nevertheless, you can use the Writer service to send and receive email.
If you've got a Zoho account then you should definitely consider installing iZoho on your iPhone, as its usable interface makes for a great way to check your work on the move.