Power up for the slug NSLU2

I was wondering is there a way to modify the hardware of the slug
such that when power is restored to the device, it powers up without
having to press the power on button.  I want to be able to shut the
power down and restore it and have the slug come on-line like my
other devices (router, NDAS, printer, scanner, USB hub, etc.).
And if there is a way to modify the device, is it easy to do or is there
an alternative device I could invest in that can be upgraded with
your firmware.

I would want to have NSLU2 or some other device (NAS200 for
example) serve as a webserver instead of leaving a computer running
all the time.