I already mentioned about Zoho Creator in one of my earlier posts. I tried playing with Zoho Sheet and it looks cool. It is a Web version of the Excel spreadsheet. You can try some stuff with the demo user. Here is a simple spreadsheet that I created. I haven't tried out all the features yet. I see some features missing but of course it's still in Beta and I expect them to be included as it evolves.

Looks like there are quite a list of applications from zoho.

Zoho Writer

Zoho CRM

Zoho Planner

Zoho Sheet

Zoho Virtual Office

Zoho Creator

Zoho Polls

The only thing that I don't like is that you have to sign-up individually for every single application..Why don't they make it a single-sign on portal?