Some of what I write here might seem slightly counter to what others have written in this thread but before I do so, I wanted to point out that the premise of Bush getting the volume of threats and the simple MSM ignoring of such things is quite true in my eyes. Most Presidents get threats and probably a shocking volume of them and to the extent that there can be no doubt about the danger of the job. With the emotion that President Bush seemed to illicit, I'm guessing he got greater than his fair share of these threats.
That said, I'm not particularly comfortable with being dismissive of the threats against President-Elect Obama. I'm Not even certain that the threats against previous Presidents and even Mr. Bush can be compared to that which would be received by the President-Elect.
The context within which he receives his threats has a history that no other President can claim, that the portion of his ethnicity that is African American was the victim of some pretty deplorable acts. Some even institutionally accepted. That, of course, is racism. Hanging from trees, burning crosses and bombed churches. Very potent stuff and stuff that was from not that long ago.
Realizing that these kinds of acts are largely in the past and the people that harbor such hate are becoming fewer and fewer, it does not make that any less real or that the threat of such a thing should be dismissed with that of the standard threat that goes with being President. The hate that comes with racism seems more like a hate that has a history of action taken. It is a special and insidious kind of hate and one that, if I were in Obama's shoes, would be very fearful of.
"Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday." Inscription on John Wayne's Headstone