oric_dan(333):
Actually, I think LM317 type v.regs can go as low as 1.2V, with the reference pin grounded.
If you want lower, try putting a 1N400x diode in series with the Vout pin.
If you connect the reference (the resistor that goes between Vout and Adj) to the "output" end of the diode, the 317 will regulate out the diode drop and still give you minimum 1.2v.
If you connect the reference BEFORE the diode, you will get approximately 1.2-0.7 volts minimum out, but the regulation will be poor due to the variance in forward drop of the diode at different currents.