Just minutes after Coltzilla posted a story covering available free agents Jim Caldwell may have alluded to when he suggested that there were a couple still on Indy's radar, Sean Jensen of the Chicago Sun Times has announced via Twitter that veteran defensive tackle Tommie Harris has signed a one-year deal with the Colts. Harris will join Antonio Johnson, Fili Moala, Drake Nevis, Jamaal Anderson, Eric Foster, Ricardo Mathews, Ollie Ogbu, and John Gill in camp to compete for roster spots. This signing has the potential to give the Indianapolis defensive line the biggest boost it has had since the team brought in Booger McFarland from the Tampa Bay Buccaneers in 2006 -- the year Indianapolis brought home a Lombardi Trophy. While Harris is a small risk, in that he has had health problems for much of the last two seasons that have limited his effectiveness, he has a massive upside if he can return to anything close to his 2007-2008 level. Johnson, Moala, Anderson, Foster, and Harris potentially present a formidable defensive tackle rotation that projects to be more effective against the run than Indianapolis has been in years past, and more effective getting penetration into opponents' backfields. Of course, Harris being a recent injury risk could cause some Colts fans to hesitate as the 2010 roster was decimated by injury. If folks were looking for a sign from the Colts front office that the team is serious about being competitive right now, the three value signings over the last 48 hours of Jamaal Anderson, Ernie Sims, and Tommie Harris should be a clear answer. If Caldwell's quote is to be taken literally, there could be another move or two on the horizon. Stay tuned for more updates as we learn of them.