Please visit the following sites which give useful information about SEO

Search Engine Submission and Optimization Company
MainStreetHost.com is a search engine submission company & optimization company, specializing in web site optimization, site rankings, web site hosting and design, and ECommerce business solutions.
http://www.mainstreethost.com

Search engine friendly websites
Contact Sagacious Softwares, India for web designing and development services.
http://www.sagaciousindia.com

Search Engine Optimisation in UK
Tapping the unique strength of the search engines.
http://www.internet-marketing-website-promotions.co.uk

Link Exchange Services
SEO Company India, Website Designing, Development SEO Services India, SEO and Link Building Company India

Improve Search Engine Optimization Rankings