This is Work not Play
Here are some useful top level links:


Facebook
Twitter
Twitter Tag Definitions
Character Counter
Twitterfon

Yahoo
Yahoo Marketing Account
Google
Google Search Australia
Google Adwords
Adwords Blog
Google Blog Search
Google Base
Google Merchant
Google Learning Center
Google Keyword Search Tool

Constant Contact
How to get more opens/clicks
2-2-2 Principle
Better Subject Lines

eCommerce Merchant Trade Association
WebMaster World
eCommerce Times
Practical eCommerce
Website Magazine
ROI Magazine
eM+C Magazine
MultiChannel Merchant Magazine

SEO
SEO Book's favorite blogs
Search Engine Watch
Search Engine Watch - Forum
Search Engine Watch - Blog
Bruce Clay
Search Engine Land
How to Improve Google Rankings

SEM
Web Marketing Videos
Search Engine Marketing Standard


eCOMMERCE HELP
How to Write How-To Articles
Google Traffic Estimator
Google Webmaster Help
Google Website Optimizer
Landing Page Optimization
Lower Shopping Cart Abandonment
Six Adwords Don'ts
Search Engine Strategies
Keyword Discovery dotcom
Bruce Clay Archive - SEO affordable?
Constant Contact - DC Learning Center
eMail Marketing Subject Line Rules (pdf)
Paid Search Basics (pdf)
Paid Search Guide (pdf)
Pay Per Click Basics