In today's USA Today there are two opeds on the use of millimeter wave scanners. The first, from their editorial staff seems to argue that the scanners would have caught Abdulmautallab:

The machines can reveal objects that metal detectors miss, such as plastic firearms, ceramics knives and, yes, possibly explosives hidden in a person's underwear.

The second, from EPIC's Marc Rotenberg, argues that they would not:

But liquid and powder explosives, of the type involved in the recent attack, are not so easily detected. Attackers know this, which is why they have favored materials that can get through the scanners. Explosives are also easily concealed in body cavities, diapers and tampons.

As they say, you are entitled to your own opinion, but you're not entitled to your own facts - one of these two perspectives must be wrong.

The online version of the USA Today links an analysis from the Washington Post. It seems to argue that a pat down wouldn't work but the millimeter wave scanners "probably" would. Its worth noting that as deployed, people can opt for a pat down instead of going through the scanners, so unless that rule is lifted, the scanners can be bypassed with this kind of bomb.

The question is, can you go through the scanners with this type of weapon or a comparable weapon? There is a right answer to this question.