Just look on the front page at the bottom, if it says REV1 - September 2009 Reprint" it has been revised (first revision) as of September 2009. The errata has been corrected in the reprinted editions. I checked, thanks to your comment!!
Originally Posted by Lacelady
The x bloks idea looks good, and I was intrigued, then I looked at the 'Ooops' page, and was less than impressed with all the amendments to various patterns.