Affiliate Window has created an infographic, based on the data from the network, on Black Friday, Mega Monday, and Cyber Monday.
Lots of interesting information there, including how there is Mega Monday and Cyber Monday in the UK. I had not heard of Mega Monday.
Anyhow, there has been big growth from 2011 to 2012 for Black Friday, Mega Monday, and Cyber Monday in the UK, according to the Affiliate Window data.
Also, Black Friday was the biggest day for average order value, followed by Cyber Monday and then Mega Monday.
More details on the Affiliate Window blog: Mega Monday Infographic.