Lots of people seem to have an issue with the post order when using the AW blog extension on Magento.
Here’s a way to change the sort order so your latest post shows up first.
In /app/code/community/AW/Blog/Block/Product Toolbar.php
Look at Line 77 and change
return ‘asc’;
TO
return ‘desc’;
That did it for us.
Magento 1.7.0.2 and AW Blog 1.2.2
Good Luck