I know there's been lots of steepening and, in cash bonds, 10s30s is approaching the historical highs (I see current 10s vs current 30s at 104bps). If you ask me, it's just a mechanical steepening on the rally. There's also talk of some stops, as people who put flatteners on too early are getting hammered. I guess there's also fear that Bernanke will be dovish and talk about a possibility of more QE, which would benefit the belly a lot more than the long end.