Quote from atticus:
I assume nonlinear believes the index markets will rise, which lowers yield. Parity with current 10-year rates would require a > 300 point rally on SPX. This assumes static $earnings [and $TYX] based upon year-end 2007 projections.
S&P earnings yield: 6.4%
10 yr bond yield: 5.2%
If the 10yr (and everything else) stays the same, SPX will have to rise 23% to reach parity.
The best way to play this, in my opinion, is to hold the spread: short ZN, long ES, or the cash equivalent of those. Effectively, it is a bet on the spread to narrow.

You know what I mean I'm sure.