Dive summary:

• Paid search increased 15% year-over-year for Q2 2012, but that represents a stark drop in growth, at nearly half the rate from last year.
• Marin Software found that cost-per-click increased 3.4%, from $.89 in Q2 2011, to $.92 in Q2 2012.
• Mobile search was on fire, with spend increasing 333%, and mobile now represents 14% of total search budgets.
• Engagement with mobile ads grew 325%, and total impressions were up 110%.

From the article:

Paid search spend growth is relatively steady, but slowing from the impressive rates seen over the previous few quarters.  U.S. mobile paid search spend increased astronomically, while organic search visits from mobile, mobile as a percentage of total search spend, and mobile clicks and impressions all rose.