You might like Steven Black's hosts file [1] which "consolidates several reputable hosts files, and merges them into a single amalgamated hosts file with duplicates removed." Sources (which can be extended easily) include: The Adaway hosts file, MVPs.org Hosts, Dan Pollock (someonewhocares.org), Malware Domain List, Peter Lowe, and Steven Black's own small list.

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

[1] https://github.com/StevenBlack/hosts

[2] https://news.ycombinator.com/item?id=5264955