Start here:

Software Development: A Legal Guide

http://www.amazon.com/Legal-Guide-Software-Development-CD-Ro...

and

Consultant & Independent Contractor Agreements

http://www.amazon.com/Consultant-Independent-Contractor-Agre...

both by: Stephen Fishman J.D : NOLO press

The bottom line is that you must take care of the IP aspects of your online business. We tend to forget such things as registering your copyright, your trademarks and maybe some patent (if you came up with some groundbreaking stuff, such as the "buy now" button).

I married a lawyer, so she handles this for me. That's a potently dangerous strategy, so if your risk aversion is higher, you may try reading this book instead: Legal Guide to Web & Software Development http://www.amazon.com/Legal-Guide-Software-Development-CD-Ro...