Book

www.xbrl.org"
XBRL is a language for the electronic communication of business and financial data which is set to revolutionise business reporting around the world. It provides major benefits in the preparation, analysis and communication of business information. It offers cost savings, greater efficiency and improved accuracy and reliability to all those involved in supplying or using financial data."

Information About XBRL (Extensible Business Reporting Language)

XBRL is an xml markup language for finacial reporting.

Ratios for Financial Statement Analysis

Lots of details on different ratios.

Moody's KMV White Papers - Single Obligor Credit Risk (Default Risk): "Modeling Default Risk"

gummy stuff ... about Investing (mostly)

A nice site about maths and fianance at a very simple level.