SimplyBill is a Web 2.0 billing web-based application.

SimplyBill lets you easily create invoices that you can send to clients by email or print out to mail. You can subscribe to your invoices with RSS (handy!), export your data for use in desktop spreadsheet applications, send reminders and thank-you messages to clients, keep track of payments you've received, get email alerts when invoices become overdue, set up recurring invoices to make sure you get paid, and tag your invoices to find out which types of invoices you send the most and which are for the most money. There are many pre-designed templates you can customize and you can use your flickr images on email messages.

Nifty!

http://www.simplybill.com

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