miki99 - 2:27 pm on Sep 22, 2006 (gmt 0)

I've been looking into why my site took a steep nosedive in the Google rankings recently (after Sept. 15), and just discovered that I have many pages listed with www at the beginning of the URL, and many more not beginning with www.

How much of a problem is this, how does it happen, and what can I do about it? Please keeping in mind that until a couple of days ago, I never heard of "canonical problems," and am not even really sure what the term means (though I did Google it, and ended up back on another wemasterworld forum, where the discussions were over my head). :-)

Many thanks for any and all enlightenment.