Resources useful for your business:

Domain Registration and Web hosting

These are all providers that I have used and found to give good service,
The US-based ones do not generally handle .co.uk domain registrations

www.godaddy.com
www.ukreg.com
www.globalhost.com

Market Research

inventory.overture.com - keyword suggestion tool
http://uv.bidtool.overture.com/d/search/tools/bidtool - bid price research
askdatabase.com - survey tool
surveymonkey.com - another one

Sequential Autoresponders

aweber.com
1shoppingcart.com - also provides auto-responser services, either bundled with a shopping cart, or stand-alone

Pay-per-Click Search

https://adwords.google.com/select/Login
https://www.google.com/adsense
overture.com - another major pay-per-click provider

Shopping cart services

1shopping cart.com - cart facilities for a low montly fee, also offers month's trial for $3.99

Credit card processing

clickbank.com

paypal.com

worldpay.com

optimalpayments.com

Affiliate marketplace

clickbank.com
commission junction

Blogging facilities

blogger.com - Free, hosted site
typepad.com - hosted, at a modest monthly fee
moveabletype.com - software (paid) to host blog on your own server
wordpress.com - software (free) to host blog on your own server

Outsourcing and Sub-contractors

Where to find contractors to do programming, page design, typing, research, ghost-writing etc

www.elance.com
www.rentacoder.com
www.workaholics4hire.com

On-going Education

Scientific Advertising Claude Hopkins ISBN 08442 31010
Tested Advertising Methods John Caples ISBN 0130957011
How to Write a Good Advertisement Victor Schwab ISBN 0879803975
The E-Myth Revisited Michael Gerber ISBN 0887307280

The System Blog, and free Audio interviews
System Smart Beginners Home study Course