> Wall warts are indeed an economical supply for many projects, but I have so
> many of them in behind my stereo stand (and of course, they are too wide
> for one slot on the power bar), that they almost take up more space than
> the equipment they power.

Actually, what I'd like to see would be some smaller wall warts.  Although
there have been a few that use HF transformers with optocoupled feedback
(an oscillator on the "hot" side generates a signal which is fed through the
transformer; the oscillator adjusts itself according to feedback about the
regulated voltage) they've tended to be expensive.  What I'd like to see,
though, would be a wall wart that skipped the feedback step and simply gave
you pretty much unfiltered DC which was 18-24v peak.  The user application
could then regulate the output in whatever manner was desired (7805 plus a
resistor and a couple caps being a nice choice).  This should be cheaper
than an optocoupled feedback circuit, but would allow the wall wart to fit
in a much smaller plug than normal.

Alternatively... what if someone just produced a multi-output power supply
with output plugs suitable for use with all those appliances?  Should be
much cheaper than a foot of wall warts; smaller too.  Think that'd be at
all practical?