SEO Bulletin

Domain Check and Value Estimation Tool - dnScoop.com attempts to estimate a value for an established website or a domain name by using factors such as:

Links pointing to the domain
Popularity of the domain
Age of the domain
Pagerank of the domain
Traffic to the domain
and more…

http://www.dnscoop.com/

This document is one of several resources created to assist the preparation of a business case for the implementation of Web accessibility. It describes the many business, technical and other benefits to the organization above and beyond the straightforward benefits to people with disabilities that can be realized by applying the Web Content Accessibility Guidelines […]

XHTML 1.0 Strict
< !DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

XHTML 1.0 Transitional
< !DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

XHTML 1.0 Frameset
< !DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

For Document Type Definitions [DTD] visit w3schools.

For keyword research check out these tools:

Microsoft adCenter Labs
Google Keyword Tool