The first amendment to the current (2009) version of the Australian Standard for Concrete Structures (AS 3600) was recently released for free download. SAI Global have not seen fit to notify purchasers of the standard of this amendment, but it does contain very significant corrections to mis-prints that appeared in the original release after approval of the final draft by the Code Committee.
The revisions can be downloaded from AS 3600-2010 Amendment 1
I will be posting revisions to my concrete design spreadsheets over the next few days. These will take account of the new amendments, and also include discussion of the best way to handle alternative concrete stress blocks, particularly for high strength concrete.