I was trying to look at the value of some 3 word .com's and thought I would punch in a popular website into Estibot to see what the potential value would be. I punched in PlentyofFish.com and immediately got a trademark notice.
That got me to thinking about how much money we could save newer members in registration fees if there was a registrar that did similar. So instead of blindly registering amazon or google domains a newbie would immediately see that resale is limited because of a trademark.
Personally I think all registrars should do this and someone needs to get the ball rolling.