I've just ordered a Hifimediy TK2050 amplifier board.
Check it out.
Tripath sound with power!!!
You need to add a power supply, input and output terminals, and of course a box (a piece of wood works).
There are huge threads about it on diyaudio.com where you can find all build informations.
That thing has great components throughout and even has speaker protection relays built-in. I can't wait to build mine!