There are lots of great Publishing Resource sites around the Internet - Here are some that you might find helpful in your publishing efforts

Amazon Sales Ranks - What they mean

Tracking Amazon Sales Ranks

What is a "Vanity" or "Subsidy" Press?

Comprehensive Book Printer List

Financial Information for your Publishing Business

Books About Publishing

Media and Publicity Services & Directories

Resources for Self Publishers - lots of self publishing help

Small Press Review Site

The low-down on ISBNs