A couple of conflicting economic indicators emerge from comScore’s (SCOR) latest web site rankings. Other than flowers (driven by Mothers’ Day), the money-saving coupon site category showed the sharpest month-on-month increase in May. However, jewelry and luxury goods also posted a strong increase.

The coupon category grew 11 percent to 24.5 million visitors during the month, as each of the top five sites in the category experienced double-digit gains. Coupons, Inc. led the category with 7.2 million visitors (up 20 percent), followed by Eversave.com with 5.2 million visitors (up 13 percent) and CoolSavings.com with more than 5.1 million visitors (up 24 percent).

Google Sites (GOOG) maintained its #1 position in the Top Properties ranking, reaching 143.4 million Americans in May. Yahoo! Sites (YHOO) ranked second with nearly 143 million visitors, followed by Microsoft Sites (MSFT) with 121.3 million visitors. Time Warner – Excluding AOL (TWX) moved up one position to #9 with 56 million visitors. IRS.gov jumped 14 positions to #20 with 31 million visitors, propelled by Americans checking the status of tax refunds and stimulus checks.