>Do you know if any of the gumstix waysmall supports or can be made to support wake-on-ring (modem)?
If by that you mean to have the entire unit (except the modem) sleep and
the whole thing turned on whenever the modem rings, no, but I suspect
you can easily build a circuitry to do that. If all you need is low
power consuption then the answer is fuzzy (something between yes and
no), because the pxa 255 with current gumstix setup do not exactly
provides a low power (to me, < 2ma would be low power) mode.