Here's why the Islamic over-reaction to the publishing of Mohammed cartoons is so ridiculous: Muslims have been depicting the Prophet for centuries. So if it's true that any caricature of Mohammed is blasphemous, Muslims have been some of the worst blasphemers of their own religion and should be boycotting themselves, not Denmark.
Check out this archive of Mohammed images, some from the Islamic world and some from Western sources. The creator of the archive says:
While the debate rages, an important point has been overlooked: despite the Islamic prohibition against depicting Mohammed under any circumstances, hundreds of paintings, drawings and other images of Mohammed have been created over the centuries, with nary a word of complaint from the Muslim world. The recent cartoons in Jyllands-Posten are nothing new; it's just that no other images of Mohammed have ever been so widely publicized.
This page is an archive of numerous depictions of Mohammed, to serve as a reminder that such imagery has been part of Western and Islamic culture since the Middle Ages -- and to serve as a resource for those interested in freedom of expression.