My problem is a bit strange. I recieved arduino with an ATMega168-20Pu and 2 unprogramed 168's. I burned the bootloader (ATboot_168.hex from http://wolfpaulus.com/journal/embedded/arduino2.html
) like it is discribed on this page. The original one can be programed without reloading the bootloadre as meny time as you want, but with the other ones i have to burn the bootloader every time y want to program them with arduino software. the fuses i used are fuse_h=0xDF fuse_l=0xC7 fuse_e=0xF8.
Something i noticed is that when i program the blinking_led example, on the original chip, after power on, it takes nearly 4-5sec before que led starts blinking. with the other ones, the led starts blinking imediately