These files don't take up much disk space and you shouldn't put them in the Trash. Each of those '.bom' files contains a list of the files installed by that package, and the proper permissions for each file. Over time, these permissions can get changed, resulting in your Mac lagging, freezing, or crashing. A quick and easy fix is using the built-in Disk Utility to repair your permissions.
In Mac OS X v10.5 or earlier, when you verify or repair disk permissions, Disk Utility reviews each of the.
