Use Redfin instead of Zillow/Trulia whenever possible. Starve the beast. (Zillow makes its money off of income from realtors seeking leads, RedFin makes its money off of actual real estate transaction fees [discounted compared to traditional commissions])
EDIT: Just read the end of the post: "Meanwhile, another organization that does understand copyright and fair use much better than Zillow is EFF. And EFF is now representing McMansion Hell."
Zillow has brought a knife to a gun fight.