This one is from Yahoo Music:
11. Jason Castro – “Hallelujah” (Season 7)
Many singing-show contestants have covered this Leonard Cohen classic […], but Jason’s remains the definitive Idol version; the song really should have be retired from reality television after he did it.
(Well, I’d put it higher than #11 but tastes differ, I suppose.)
For the rest of what they say about Jason–and the other 39 performances–click on through.