I saw this link about programming ATTiny:
http://hlt.media.mit.edu/?p=1229
is it possible to make an ATTiny board to replace the Uno for programming other ATTiny chips?
they appear to have the same pins that are used by the Uno; 'SCK, MISO, MOSI'...
As far as I know… you
As far as I know… you can’t use UNO to program other AVR’s…
you should better use an AVR ISP programmer… like the one from Lady Ada the USBTiny 
it works for me 
the link isnt working for me
the link isnt working for me
well you can, check out the
well you can, check out the link i posted.
you just have to add some stuff to your arduino installation and run a sketch that makes the Uno
into an ISP.