This is like mid-2008, when everyone had kindaknew that there was a housing bust and the **** was gonna hit the fan, but they didn't know when, and just didn't want to accept it. you'd see the market take sudden dives as all the investors collectively said "Oh ****, this is it!", then come back up or settle out for a few weeks as investors talked themselves out of what they knew.
well, Greece is going to default in some way or form, and Spain and Italy aren't too far behind. Europe is just in denial about it, and is just kicking the can down the road hoping some miracle pops up to save their ***. For a while Friday it looked like the **** was finally hitting the fan, and investors fled to the safety of US T-bills, driving the rate on 10-yr bonds to 1.77%, which just shatters the old record low. Then Europe found a way to kick the can a bit farther down the road, and investors are wading back in, with the 10-yr rate now almost back to 2%, which is where it's hovered the last few weeks. Investors are back to deluding themselves that everying will be just fine. But in a few weeks, it'll all happen again, until one time the **** finally sticks to the fan.
So, it's ok if you don't lock in, rates are probably not going to go higher any time soon, especially with the Fed's 'Operation Twist'. But like another poster said, the difference is kinda meaningless, especially compared to the risk (here, the risk is that like late 2008, banks stop lending at ANY rate). If a bank is making you take a higher rate to lock, i would pass. I would tell several banks that the first to lock you in at that point's current rates gets your business.