All this talk of cheap UPSes is timely...

I'd like to be able to provide a few seconds of +5vdc to a device so that
when its main power line fails it gets to "finish what its doing" (which it
will if it is no longer being fed data, but needs a second or two to do so).

Super or ultra caps come to mind, but I've never worked with them and some
casual Googling hasn't turned up too much of interest.

Any suggestions on where to start or tips? Obviously I don't want to end up
with blown caps and/or blown device!

TIA.

-marc

P.S: Oh, power draw for the device is 150mA nominal....so hoping I can just
do something with a Schottky, resistors and cap!
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