Free and Easy Online PDF Forms, Faxs and Shopping Cart

Fillanypdf.com enables your accounts to complete orders online on interactive pdf forms. You upload your form (up to 5 is free) and they fill them out and digitally sign them.

Interfax.net is cheap outbound fax and efax is free inbound. Combine them for a no-print fax solution.

I ran into a free ecommerce shopping cart (6,000 users as of late July 2010) which is hosted on their servers but integrates seamlessly with your website. They rely on third party payment systems to process credit cards: Google Checkout, Paypal, Authorize.NET, and 2CheckOut.