speaking of hosts file, here is a pretty good one [0]. albeit it may block more than just ads however I find its nothing I want to see anyway.
WestCoastJustin shared a great one-liner [2] for checking the list to make sure there were no nefarious entries; here it is without the unnecessary cat command:
grep -v '#' steves_hosts | awk '{print $1}'| sort | uniq -c