Added Towny bank support using takeTownMoney and giveTownMoney blocks (Thanks ryvix!)
Added [Restricted] signs to limit shop usage to only the permission groups listed on lines 2,3, and 4 of the sign. You can also link more than one [Restricted] sign to a shop. Note: You will still be able to use your own Restricted shop.
Changed [Share] signs telling the buyer how the money was being distributed
Variable amounts is currently paying the full money for partial item amounts. Disable AllowVariableAmounts in your config.
There is no nice way for plugins to store the information written in books for 1.3 yet, so we cannot add buying and selling books until the Bukkit team updates their API.