Yes, that's one considered use. If you know C++ or Java, then by using Exporter without restrictions, you may all your variables of your package public; this is usually not good OO programming practice. Using our specifies only which variables you want public, which is the better way to go.
Also, to note: you should have "my $a = ..." in the Exporter example to keep everything strict.
Dr. Michael K. Neylon - mneylon-pm@masemware.com
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"You've left the lens cap of your mind on again, Pinky" - The Brain