Don't know of anything to do it as a swift action. However, I really like combining Steadfast Boots (MIC) with Cometary Collision feat (PH2).
The boots give you +4 stability and let you set vs. charge for double damage with any weapon (the idea being to use a bludgeoning weapon + greater mighty whallop for massive damage dice). It actually says you're always readied against a charge, but I don't quite know what that means, I always just assume it means you can ready with any weapon, cause the literal reading is...crazy.
The feat lets you ready to charge as a standard action (this is key, I know of no other way besides being action limited to get a partial charge), the trigger being an enemy charging. Not necessarily at you, just charging, in a direction or from a position such that you could intercept him.
So...you use the feat, readying against a charge...with a charge. When it triggers, you get your double damage. What makes it nasty is tacking on things like pounce (Barb 1) for a full attack, Leap Attack (2-handed PA is now a 4-1 trade in, AND you're about to double that), Shock Trooper (take PA penalty to AC instead of attack), and Stand Still or Knockback, depending on what criteria you can meet (so they can't retaliate afterwards).
I like this set up because it covers a MUCH larger range than the typical Hold the Line build; protects basically all allies against charges, instead of just you and those near you; and does scary high damage. It's also more feat intensive, of course.