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This is a very popular adjustable linear voltage regulator used everywhere. The only catch is that a lot of heat sinking is required if you have a large current load and a large delta between VIN and VOUT

Specs: http://www.national.com/ds/LM/LM117.pdf

Voltage In: >= 28V

Standard Voltages Out: 1.2V to 37V

Current Out: 1.5A

Highlights: Requires no caps unless the load is greater than 6 inches from supply.

LM317 Formula.png
Package comes in SOT-233, T0-252, T0- 263, TO-220-3