I reported earlier this morning that some scam artists are using DNS Cache Poisoning to redirect your PPC and organic listings to other pages. First reports of this come from WebmasterWorld, where it has been documented that an advertiser was targeted and exploited. Basically, the attacker will poison your DNS cache (if it is possible) and then "redirect a popular search engine to a pop-up ad site," or something similar.
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.