App Stop V.6 is now available for download. This release includes the following features & bug-fixes:

• Fixed bug where stopped applications would prevent your computer from sleeping
• Support added for sleep/awake/shut-down operations
• Added preference panel
• Added hide application before stopping feature
• Added show application after continue feature
• Added ability to specify the icon size
• Added ability to set priority for applications
• Added authentication for lowering priority on applications
• Full source code is now available (To correctly view the project structure you must have Xcode 2.1)

Enjoy!