Last month OmniDrive integrated Zoho Writer into their application. In their recent update, our friends at OmniDrive integrated Zoho Sheet. If you have an XLS file uploaded in OmniDrive, just double click on the file and it opens in Zoho Sheet. You can view it, edit it and save it back directly to OmniDrive.
Look @ OmniDrive’s Blog post for more details on their recent update.