You can check the rankings of safelists and traffic exchanges at
TrafficHoopla
to see which are performing well, but remember to track your own ads to see which are working best for you.
Safelists
Send emails to opt-in members of the lists - you WILL receive emails from members in return, so don't get angry, just accept it
as part of the advertising process! I also recommend setting up 2 gmail email accounts (free & better delivery rates than most
free emails), one to use as your 'contact' email and one to use as your 'list' email - this will make more sense when you join a safelist! Adtactics EuropeanSafelist - the most responsive safelist I've used FreeSafelistMailer EliteSafelist GlobalSafelist GOTSafelist TheTrafficSecret VitalAdViews