Every Hour

http://dailybitcoins.org
http://www.bitcoins4.me
https://coinad.com (daily-hourly with registration)


Every Day

http://bitcointree.net (daily)
http://freecoins.herokuapp.com (daily)
http://netlookup.se (daily)
http://www.bithits.info (daily)
http://cointicket.org (daily