Today is Cyber Monday. A term that still lives on apparently, despite its shaky origin.

First off, today is not the busiest online shopping day of the holiday season (busiest day will be between 5th and 15th of December). It is just a Monday, where people are back from a long holiday weekend. The term Cyber Monday, which was created by Shop.org (part of the National Retail Federation) just made it into the retailer marketing strategies in November of 2005.

Last year there wer not really a lot of specific deals or marketing by online retailers for the Cyber Monday. This year it seems there is more drum rolling and deals for Cyber Monday. Cyber Monday might just become a self fulfilling prophecy in the future.

Cyber Monday Promotion Examples:
Buy.com has a big Cyber Monday banner on their homepage associated with lots of deals.
Walmart also has a big Cyber Monday deal offering which runs from today until December 1st.

Amazon just extended their Thanksgiving Sales until today. They do not specifically market with Cyber Monday.

Wikipedia has a good background on the Cyber Monday topic.