Was Jensen joking? Because Jensen has spoken many times about what good friends he is with Welling and continues to be to this day.
I, too, would love to see him guest star on Supernatural. I remember the stories from the early seasons, when both shows were filming in Vancouver. How Tom hid himself in the back of the Impala during one take and then popped out and everyone lost their minds. As Jared Padalecki put it "the Winchesters step out and then hey, it's Clark Kent!" (Really wish that had been filmed, as it would have been awesome on the gag reels.)
Kitty: Is there anything you can't do?
Dr. Doom: Knit. I find it too repetitious.

Funny, since Ackles is the one that comes across as a douche bag with his almighty attitude.

I'm pretty sure Jensen Ackles called him a douche bag in an interview. Maybe they hate each other.

He'd make a great bad angel.
"You can't have my heart."

I miss Smallville too :(.
~Nothing gets the blood pumping like a good fall down the steps.~

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totally agree would love to see him. I would like him to play a baddie though. Something completely different than his role in Smallville. Plus he always looked hot when he was Kal

I would really love that.111c I'm upset that he hasn't done anything since Smallville ended. And I REALLY wish he would have starred in the Man of Steel.