I already addressed the 'bonds in a bubble' thesis here. However, anyone who thinks that an asset yielding 1% is in a bubble, is in for a rude awakening. The total bond market is several times larger than the stock market - the treasury market alone is twice as large and unlike the stock market, it's not a speculative casino. Interest rates/yields are based primarily on default risk and inflationary expectations. The much discussed $121 billion pulled out of mom and pop equity mutual funds in the past year equates to just slightly more than one month of Federal Government deficit borrowing i.e. it's one Obama signature on a slow day...
The accelerating decline in yields indicates accelerating deflation
Notice when Quantitative Easing (QE1) started (i.e. March 2009), the stock market AND yields leapt higher i.e. they were highly correlated to the nascent reflationary economic expansion. At that time, the stock market was much lower than it is now, whereas yields were much higher. Fast forward two rounds of QE, one Twist and two LTROs later - over $3 trillion in debt monetization already pumped into the system and yet yields are back down to where they were at the worst part of the Lehman crisis.
Now that IS scary...