Well, for people that don't want to get bothered with a long Linux download before flashing with the latest kernel, too :) here comes a quick & dirty XeLL ISO that'll do the trick in a few seconds, since eFuses appear to be quite valuable those days ...
Update : you can read your NAND (without ECC) as well.
The usual stuff - as described on Free60
You'll download the eFuses list directly from your Xbox 360 connected to your network