I would like to know if at all the Official Guide has been changed since its September 2005 Release. I purchased the OG 11th Edition in November 2005 and would like to know if there is any difference in the version or if any new version has come out between this period of 1.5 yrs.

I spoke to an institute and they told me that there is another version of OG 11th edition released in June/July 2006. Is this true? As i am doing self study now, can i continue using this same old book OG 11th Edition or do i purchase the same book again because of its version change (if any).

Thanks
Vishist Gupta