I googled for it in order to give you the link and discovered a whole page of different albums of a similar ilk, with lullaby covers of bands including Metallica, Nine Inch Nails and The Ramones.
Seems to me the least I can do is plug them thus, given that I shameless stripped out the DRM from the version I bought on iTunes, then infringed the associated copyright with gay abandon.
Update (10.01.08) - You can download this by right-clicking on this link and saving it to your desktop.