SOR fell to 0.31%, presumably the all time low. This is probably a result of the revaluation of SGD against USD from 1.39 to below 1.38, which makes it cheaper to repay loans denominated in US dollar. The Fed reiterated their plans to keep interest rates low for a long time, while Malaysia, India and Australia, among others, have raised rates. In the longer term, rates are expected to surge, so do watch out.
Update 16 Apr 2010: new all time low 0.31%
Update 23 Aug 2010: new all time low 0.258%
Update 11 Aug 2011: new all time low -0.7%