John Resig (jQuery developer) riffing on why google groups is dead. Some good points, they moved the jquery discussion over to a zoho discussion product instead.
Zoho is a multi-currency, online invoicing tool. Free to $35/mth from 5 to 1'500 invoices/mth, pdf invoicing at all levels. $5/mth for 25 invoices, unbranded. Integrates with online payment and Zoho Project.
Thinkfree is similar to Zoho. It's a hosted, online office suite. It's also available in self installed versions. No email capability (that I can see).
Google Apps is the hosted mail / docs / etc product from Google. It comes in Free or Premier ($50/year/user).