Treasury bills have been providing remarkably low yields recently. And the Fed today cut their target federal funds rate to 0-.25% (what is the fed funds rate?). With such low rates already in the market the impact of a lowered fed funds rate is really negligible. The importance is not in the rate but in the continuing message from the Fed that they will take extraordinary measures to soften the recession.
There are significant risks to this aggressive strategy (and there would be risks for acting cautiously too). But I cannot understand investing in the dollar under these conditions or in investing in long term bonds (though lower grade bonds might make some sense as a risky investment for a small portion of a portfolio as the prices have declined so much).
The current yields, truly are amazing as this graph shows. The chart shows the yield curve in Dec 2008, 2006, 2000 and 1994 based on data from the US Treasury