fixed for 1.4.3
// eddie modification free shipping not including tax.
around line 1360
change:
$total_free_ship = $free_ship - ($this->getOrderTotal(true, Cart::ONLY_PRODUCTS) + $this->getOrderTotal(true, Cart::ONLY_DISCOUNTS));
for
$total_free_ship = $free_ship - ($this->getOrderTotal(true, Cart::ONLY_PRODUCTS) + $this->getOrderTotal(true, Cart::ONLY_DISCOUNTS) - $total_tax);