Mobile made up 26% of search traffic tracked by SEO firm RKG in Q2, up from 24% in Q1 and just 15% a year ago. Google (GOOG) and (Bing-powered) Yahoo (YHOO) each got 28% of their traffic from mobile, and Bing (MSFT) only 15%. Google got 31% of paid clicks from mobile (a sign Enhanced Campaigns are helping?) vs. 19% for Bing and Yahoo. Monetization still lags, but (as suggested by other reports) the gap is narrowing; mobile rose to 22% of ad spend, fueled by 165% and 261% Y/Y increases in tablet and smartphone spend. Moreover, tablet ad prices were roughly even with PC prices; smartphone prices remained 40% lower. One problem for Google: iOS made up 69% of mobile traffic, and Google has to give Apple (AAPL) a big cut on much of it.