Okay thanks.
I found a small dc-dc converter that can do 1.25v-10v but it seems none of the dc-dc converters can do < 1.25V any idea on something available to control to 0V?
For the most part, 1.25V is the voltage reference used inside the DC-DC converter (usually on chip) and so that is the minimum the converter can provide with regulation.
I agree with the buck converter route, although you could theoretically use an LM317, with paralleled external power transistors. The minimum of that regulator is also 1.25V, but you can compensate for that by using an ICL7660 to create -12V, a resistor deivider to get it down to -1.25, this would cancel out the reference voltage, meaning you could get the output close to 0V. Although you'd still have a hell of a lot of heat to disapate, which may not be prudent for reliable operation.
As for a MCU controlled buck converter. Keep an eye on the response time, sometimes firmware can be too slow to adjust the voltage, but for the most part in control apps, its not an issue. Many microcontrollers have onboard comparators with voltage references which would make your life easier. You could of course use an external voltage reference, and a precision voltage divider to get it <1.2V. I believe microchip have an application note regarding SMPS with code included...I'm sure you could adapt this for other micro's though.
Depending on available parts and efficiency, you also might want to look into 'synchronous rectification'. It requires more control, but for such low output voltages it keeps the efficiency sane, as at <2V the voltage drop across the shottky diode in a buck converter becomes significant.
All that said, for simply designing a 0-10V source at 1A that doesn't double up as a heater, it shouldn't be too difficult. Parts only become critical when efficiency and precision regulation is paramount.
Blueteeth
Edit: A quick check over at
Linear Technology - Linear Home Page they have quick a few buck regulators capable of 12V in, with down to 0.6V (or less) out @ 2A+, most have integral MOSFETS so the part count is low. LTC3603 for example.