comScore, a leader in measuring the digital world, today reported holiday season retail e-commerce spending for the first 35 days of the November – December 2010 holiday season. For the holiday season-to-date, more than $17.5 billion has been spent online, marking a 12-percent increase versus the corresponding days last year. The most recent week saw four individual days eclipse $800 million in spending, led by Cyber Monday, which became the heaviest online spending day on record at $1.028 billion. Tuesday, November 30 reached $911 million, making it the third heaviest online spending day on record, with Wednesday ($868 million) and Thursday ($850 million) also reaching high levels, although growth rates for the season subsided in the latter half of the week and through the weekend.