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Are you really sure you didn't mix up the sides of the chip?
If the Attiny gets hot that usually means you connected it the wrong way.
http://highlowtech.org/wp-content/uploads/2011/10/ATtiny45-85.png
If you let it get too hot there is a chance that it is broken now and heats up even when connected the right way.
Maybe you have to try another chip.