Meh, from what I've heard he apparently had surgery on his throat back in 05-06 because he couldn't breathe properly through his nose.
Is it true? I have no fucking clue.
Also, he's getting old.... check out Judas Priest 1986 live on youtube performances, then check out their more recent ones.
But I DO like how he actually puts more melody(right word? Not good with vocab) into his voice. While it sounds cooler and gets me more pumped when he roughens his voice a bit, I really like him live but it shows his true musical talent.
Btw, I'm half tempted to make a topic with all of Judas Priest's 1986 live performances when I get home. Really good and REALLY entertaining. It pains to me say this but, while I believe David has a better voice, Halford might have been the better frontman back in the day. But, I do prefer David :)