some popular "banned" filehosts you should add on there by default (most forums hate these):
sharedpartners.com
sharecash.org
uploadbox.com
e45.org
vip-file.com
sms4file.com
filesmonster.com
ifolder.ru
file-rack.com

linkbucks.com
usercash.com
urlcash.net
urlpulse.net

tinyurl.com
lix.in
these should be added by default IMO, its easy to forget to blacklist one.