Primary bias circuitry are a very common problem for SMPS design.
It can be divided in two broad categories:
-If all that you are going to power is the controller IC itself, usually a a startup circuit as described above, plus an auxiliary winding which will actually keep alive the controller during normal operation. All modern IC controllers feature very low startup current to minimize power dissipation.
-If you are going to power many other loads, like communication ICs, microprocessors, fans, etc, the best is to use either one of the small independent bias supply such as those offered by Power Integrations or ST Micro.