Online shoppers kept e-commerce companies' virtual cash registers ringing last week, according to recent data.

Consumers spent $1.66 billion at U.S.-based online retailers in the week ended Nov. 28, according to comScore Networks. That was up more than 36% from the same period last year.

Online shoppers spent another $406 million at North American-based e-tailers on Monday, according to data from Internet security firm

VeriSign

(VRSN) - Get Report

. On a typical, nonholiday, consumers spend about $100 million online, VeriSign representatives said.

ComScore and other analysts have

predicted strong e-commerce sales growth this holiday season, and the latest data seems to indicate that those expectations are being met.

Such expectations have helped boost the shares of e-commerce companies such as

Overstock.com

(OSTK) - Get Report

,

eBay

(EBAY) - Get Report

,

Shopping.com

(SHOP) - Get Report

,

eCost.com

( ECST) and

GSI Commerce

( GSIC), all of which have seen their shares jump in recent weeks.

The data from both comScore and VeriSign indicated that online spending was robust throughout the holiday weekend. Spending jumped 100% on Thanksgiving Day, according to comScore. Consumers spent about $75 million that day at North American e-commerce sites, as the number of individual transaction rose 40% over those made on Thanksgiving Day last year, according to VeriSign.

On Black Friday -- the day after Thanksgiving and traditionally one of the biggest shopping days in the overall retail season -- online spending grew by 41%, according to comScore Networks. The number of transactions increased 31% that day, according to VeriSign.

ComScore's data comes solely from e-commerce sites based in the U.S. and excludes spending made on online auctions or travel sites and large corporate purchases. VeriSign's data, which includes sales made at sites based in Canada and Mexico, includes travel purchases, but largely excludes online auction sales.