There are several good sites that have rated oil filters, with some suprising results.
See:
http://www.knizefamily.net/minimopar.../opinions.html
http://www.knizefamily.net/minimopar...reference.html
http://www.nordicgroup.us/oil.htm#5W30%20versus%2010W30
According to the reviews, the oil filters to avoid are:
AC Delco Duraguard
Champ
Fram Extra Guard
Fram Double Guard
Fram High Mileage
Pennzoil
Quaker State
STP
http://www.ntpog.org/reviews/filters/filters.shtml