This weeks EDN Magazine has a "design ideas" note on using switched-capacitor
voltage doublers (backwards) to cut power dissipation in cases where the
input voltage is more than twice the desired output voltage.  It's by a
Linear technology guy, and the example uses the LT1054CS8, so you can
probably find it on the LT website as well.

Their example does 5V or 3V @ 200mA from 12V input, using an SO8 chip and
no heat-sinks.  Pretty neat idea...

BillW