After coming back strong in Q1, US paid search spending continued to regain strength as 2010 went on.

According to SearchIgnite, year-over-year paid search spending was up 14% in Q2, compared with a gain of 11% in Q1. Spending was down slightly, by 2%, quarter-to-quarter—considered a normal part of the summer slowdown in marketing activity.

Individually, the major search engines each dropped in spending growth since Q1 but rose year over year, with the greatest gains made by Bing.

Google’s own earnings report agreed closely with this data, with pay-per-click ad revenues gaining 15% quarter over quarter and dropping 3% year over year.

Reporting on search marketing spending rather than just paid search, Efficient Frontier noted a 24% spending increase year over year and a 9.7% rise quarter over quarter.

The company reported little change in the share of advertiser dollars going toward the three top search engines, but Bing continued to solidify its share of the total while Yahoo!’s dropped slightly. Click shares performed similarly.

According to Nielsen, Google took 65% of all US search queries in June 2010, compared with 13.7% for Yahoo! and 13.4% for Bing. Bing had grown moderately in share month over month and significantly year over year while Yahoo! posted declines and Google’s share was flat.

comScore rewarded a somewhat higher share of the total to Yahoo! and reported total search queries were flat at Google and up 7% and 8% at Yahoo! sites and Microsoft sites, respectively.