I wanted a nice powerful stereo amplifier for studio use, I'm pretty sure this will drive a few pairs of headphones/speakers though I've only tried it with one pair.
this would also be well suited for a nice set of powered monitors for a laptop or any other application.
anyway, I found the TPA1517 from Texas Instruments and it works great.
the powersupply needs to be very clean maybe even external to the unit itself. you'll notice there is a resistor across the terminals of the big capacitor (4700uf) this is a bleed resistor and its purpose is to discharge the capacitor once it is powered off, with the value stated it takes about 3- 4 minutes to discharge the 4700u 40v capacitor. it's not a necessity but it's advised to avoid electric shocks - even the 40 volt cap I used packs a nasty punch.
when you turn it on don't have your headphones over your ears - this is very very loud so the input signal needs to be raised very gradually