Harrington /Pollard for Cato/Mobley does work per Real GM. I say if it comes up, do it. Here's why:
-The Pacers get a SG who can score and defend. Is he the best guard available? No. But he gives the Pacers what they need: outside shooting. The Pacers are essentially only giving up Harrington for him. That's better than giving up all of our SF's for one guard.
-The Pacers unclog their SF rotation. Bender gets more playing time. Cro gets more playing time. Roster is balanced a little more.
-Pacers get a big defensive C. Cato replaces Pollard, a center that clearly did not fit in here. Cato fit in pretty well in Houston(a defensive team), so I don't think he'd have too much trouble fitting in here.
Hill or Gooden
As for why Orlando would do this? Well, Al could be a good player for them and a major contributer in case Hill isn't healthy or if Dwight Howard isn't ready yet.
I like the trade. It doesn't bring in a superstar, but then again the Pacers never really needed another one.