Are you sure you actually killed it? I bought one ages ago, managed to screw it up, but there is a process you can go through to revive dead AVR MKI's, it involves shorting out a couple pins inside the programmer while powering it up which puts it into a 'pony prog' compatible programming mode which allows you to re-flash it. Worked like a charm on mine, you just have to make sure you keep those two wires shorted for like 5-10 seconds (docs say 2 but I hade to do it for over 5 to get mine to work) before it'll go into the ponyprog mode.
I didn't find this out till I bought my second one, I gave that one away a couple years ago, I still have one left, I'll check to make sure it works, but I have an STK500 now so it's of no use to me, if you can't revive yours. Check the AVRStudio help files it contains complete documentation on the AVR ISP. Even if you did completely wipe the main programing chip a second AVR ISP can be used to connect to a 6 pin ISP header in the ISP to reflash the base chip in the AVR ISP so don't toss it yet unless you actually let out the smoke, which is kind of hard to do with these programmers, I imagine there are quiet a few in land filles that could easily be revived.