I'm reading the BOM for the diyAudio power supply board. It lists resistor values in a range, such as 0.47R - 1R or 4.7K - 22K. What determines which values I should use in a given build?
If you don't know the needed snubber values (0.47R - 1R) you can leave them out (read in the Quasimodo threads about it). It will work fine without and really no point using random values as it won't help much.
The bleeder resistor 4.7k - 22k depends on your voltage, but is also kind of optional. If you don't know, go for 10k - 22k and you will be fine. Note that high value will leave circuit with voltage for a longer time after turning it off. Some people don't use bleeder resistors at all. But be aware that the circuit might have voltage for a long time after power off if you don't have them.
The bleeder resistor 4.7k - 22k depends on your voltage, but is also kind of optional. If you don't know, go for 10k - 22k and you will be fine. Note that high value will leave circuit with voltage for a longer time after turning it off. Some people don't use bleeder resistors at all. But be aware that the circuit might have voltage for a long time after power off if you don't have them.