Doodle, Google Docs and Zoho

Google Docs and Doodle look like fine collaborating tools. They will be useful for collaboration... if not as fun and exciting as the other online apps/"toys". Google Docs will be good once I understand all the sharing aspects. Doodle looks like it will be effective scheduling meetings and events. Zoho looks to be just another option for an online office suite. Google Docs I believe has more of an established base of users. I'm not sure what Zoho would have to offer above and beyond?