Two interesting articles on Muhammad: "Muslim Mindset, The hatred is Muhammad himself" and "Time to unmask Muhammad."
For those who will be inclined to view these articles as anti-Muslim hate speech, I would strongly recommend reading The Life of Muhammad by Ibn Ishaq. This is the very earliest biography of Muhammad and was written by a devout Muslim. I've read it. It is not the easiest read, but it is very enlightening! You will then be in a position to determine for yourself what Muhammad was like.
If you don't have time to wade through all 690 pages of Ibn Ishaq (not counting notes and index), I would suggest an outstanding summary of Ibn Ishaq called, Muhammad and the Unbelievers (only 167 pages).
If you don't have time to read 167 pages, you could read an even shorter (much shorter) summary of Ibn Ishaq in my "Jesus, Muhammad and Fundamentalism" (only 47 pages).