QuickBooks Basic, QuickBooks Pro and QuickBooks Premier 2003 contains a large number of substantial new features including: 

== The ability to create a budget and/or forecast easily and
   automatically from within QuickBooks

== More professional forms and form customization so you can tailor invoices and statements to your business needs

== Advanced options for backing up data, including automatic
   scheduled back ups

== Inventory tracking by component and finished good, so if you have a product-based business you can manage inventory
   more effectively

== Enhanced class tracking that allows users to track all
   expense and income items more precisely by class

 

There is a great tool @ www.quickbooks.com where you can compare your current version to one of the new ones to see what features have been added for you.