Kevin Goldstein just tweeted that the Blue Jays signed Koby Clemens to a minor-league deal.
Clemens peaked in 2009 with Lancaster, hitting .341/.415/.636 for the JetHawks, and then followed that up with Corpus in 2010 with 26 HRs and a .241/.350/.476 line. He hit .234/.331/.424 in 126 games (444 PAs) with OKC in 2011.
Clemens was the Astros' 8th Round pick in 2005. That leaves Brian Bogusevic, Brandon Barnes (who may actually still be a minor-league free agent), and T.J. Steele as the only players from the '05 draft still in the system. In an interesting little side note, the Astros' 50th Round pick in 2005 was Wes Musick, whom the Astros received from the Rockies in the Matt Lindstrom deal.
UPDATE: The Commenter Is Right. Forgot they drafted Steele in 2005, and again in 2008.