Over the last 3 months the yields on corporate bonds have increased while treasury bonds have decreased. The chart shows the move away from lower quality bonds to higher quality though probably not as dramatically as actually has taken place as it is just an average for each month (and in September the flight to quality became extreme at the end of the month). While the Fed did not announce a formal cut in the discount rate, the average rate for overnight loans from the Fed last month was 1.81%.
The spread between 10 year Aaa corporate bond yields and 10 year government bonds increased to 196 basis points. In January, 2008 the spread was 159 points. The larger the spread the more people demand in interest, to compensate for the increased risk. The spread between government bonds and Baa corporate bonds increased to 362 basis points, the spread was 280 basis point in January. The rate on government bonds has barely change (decreasing from 3.74% in January to 3.69% now) so the change has nearly all been in increased corporate bond rates.