Spent a bit more time on ModHQ to get it working with the beta formats; The beta uses a BTX texture format (bitmap), the BAR format is slightly changed, and XMB files sometimes contain uncompressed camel-case XML.
Download (.net binary & source code)
Theres more discussion about the Alpha & Beta versions over here: http://aom.heavengames.com/cgi-bin/forums/display.cgi?action=ct&f=1,29492,0,20, go check it out and run it through ModHQ to see all the sweet sweet game assets.