!SyLevel

• Is a lightweight addon which displays item level text on your item slots. It offers support for addon authors wanting to include functionality in their addons.
  

Features:

• Customizable display locations (listed below)
  
• Customizable filter to limit display on item levels below a level you set.
  
• Chose from one of four possible coloring options.
  
• Embedded LibItemUpgradeInfo-1.0 to ensure accurate item levels are displayed.
  
• Expandable to your addon (aimed at addon authors if you are one).
  

Display Locations:

• Bags
  
• Bank Window
  
• Character
  
• Character Equipment Flyout
  
• Guild Bank Window
  
• Inspect Window
  
• Loot Window
  
• Mail Window
  
• Merchant Window
  
• Profession Window
  
• Trade Window
  
• Void Storage Window
  

This is an initial version so please feel free to leave any feedback in the comments and I'll be sure to respond!

A special thanks to haste for allowing me to use the framework of his addon oGlow