From the help file:

• PowerDesigner plug-in
• XML Web DataWindow
• DataWindow .NET
• Unicode support
• MonthCalendar and Animation controls
• UDDI support for Web services
• EAServer components as Web services
• SOAP processing methods for Web services
• Web DataWindow DTC
• JSP deployment to Enterprise Portal
• Accessibility
• MobiLink support
• PBCrypto proxy object
• PBNI changes
• ADO.NET database interface
• Database connectivity changes
• Miscellaneous changes

The following new features were added in PowerBuilder 9.0.1 and are included in PowerBuilder 10:

• User interface enhancements for XP look and feel
• PBNI support for Any variables and values
• PBX_DrawVisualObject function for PBNI visual objects
• SetProxyServerOptions function for SOAP Web services
• Hiding the JSP Page view
• New menu options in the SQL Select and Query painters
• New Excel format for saving data
• New DBParm: PBNewSPInvocation
• Additional changes

From 10.0.0 Release Notes:

Other Changes (not mentioned in the help file)

New Features in PowerBuilder 10.0.1

New Features in PowerBuilder 10.2