MarketingSherpa just posted the results of ad:tech’s Fifth Annual survey of ad:tech attendees. They surveyed 421 Internet marketers on the online Marketing tactics that worked and those that didn’t work over the past 12 months.

Good news for ReachForce Customers: ad:tech found that “House lists top paid search: More marketers reported success with house email lists than paid search ads — a reversal from a year earlier.” That’s a good indicator that B2B Marketers should keep their house database clean and continue to invest in demand generation programs targeting those lists.

Other important findings include:

• SEO is generating high ROI
• Paid search continues to perform, but is down steeply from 2006 possibly due to intense PPC competition.
• Viral marketing is still popular as 93% of marketers said agencies recommend either an increase in spending or begin spending on viral video.
• 87% plan to increase viral marketing on social networking sites.