LearnBoost, a great online gradebook service, has updated the way that teachers and school administrators can allow students and their parents to view their grades. You can read the full announcement and directions here. The short version of the story is LearnBoost has made it easier for students and to organize their access to grades. In the past students had to keep track of multiple access credentials for each class. That inconvenience has been removed now.
Full disclosure: LearnBoost is an advertiser on Free Technology for Teachers.