Then you might want to download fseventer and it will tell you the following:

• Observes filesystem changes using the same underlying API as Spotlight
• Provides a graphical representation of the file activity
• Example use could be to determine what files are changed via software installation, preferences, etc
• Requires admin access & will only work on Mac OS X 10.4+ i.e. “Tiger”, “Leopard”, or “Snow Leopard”