Was Prophet Mohammed Illiterate?

I have seen it suggested that Prophet Mohammed was unable to read or write, and that this makes the Qur'an even more miraculous.

I am now searching in google for arguments pro and con.

I must say at the very outset that I have no opinion myself regarding this matter, which is why I am searching google to see what various people say.

Here is the first link I found, which argues that Mohammed was able to read and write, and that a certain word in the Qur'an, "Ummy", has been misinterpreted as "illiterate."

http://www.free-minds.org/articles/themessenger/mohammed.htm

I shall return and add other links, pro and con, to this post.

This link does not address the question of the Prophet's literacy, but it is an interesting read regarding the history of the Qur'an.

http://www.yementimes.com/02/iss3/culture.htm

As I search on this question, I encounter many links which are hostile to Islam, which I shall ignore, out of respect, and shall confine myself only to serious Muslims who comment regarding the Prophet's literacy.

Here is an Islamic link which asserts that the Prophet was illiterate (ummy), and is also a very interesting read:

http://members.cox.net/ameer1/truth.html

Here is an article by a devout Muslim which argues that the Prophet was unlettered, thus making the Qur'an more miraculous, and less likely to be something that Mohammed devised:

http://www.jannah.org/articles/quranwrote.html

Here is another interesting essay by a devout Muslim which argues that Mohammed was unlettered.

http://www.islam4all.com/new_page_34.htm

Here is a very nice powerpoint presentation which I am sure will be of interest to many:

www.islam101.com/presentations/Islam_presentation4.ppt

During the course of this search, and during my chats in Yahoo, the interesting topic of Madrasa came up, and of the unusual rocking motion, back and forth, that one sees the students engage in as they recite their readings.   The orthodox Jews have this exact same rocking motion during their prayers.  I was wondering if such motion existed from the earliest days of Islam, or whether it is a much later innovations.  The following link speaks of such rocking motions, but in a critical light:
The above-mentioned link seems so critical, that I became curious what sort of book it is from, but it is review here by what seems to be an Egyptian publication:

http://weekly.ahram.org.eg/1999/437/bk6_437.htm