Version 6.0.3 and Snow Leopard

Even though the principal change in TechTool Pro 6, version 6.0.3 is the addition of Lion compatibility, it is still fully compatible with previous versions of Mac OS X dating back to 10.4.9. It is recommended that all TechTool Pro 6 users update to the most current version.

 

The full list of changes can be found here.