LifeinAsia - 7:48 pm on Jul 9, 2010 (gmt 0)
Fire them. In many (most?) cases, being delinquent in giving you content carries over to being delinquent in paying you. Instead of spending your time and energy on them, devote that time/energy to getting better clients.
If you do keep them, make sure you factor in an extra "aggravation" surcharge on your fees to them.