The current state of affairs between IBM and Microsoft.
Religious wars are a part of American culture.
Ford vs. Chevy probably wins the prize for most popular and longest lasting. In the personal computing age, dweebs have found it necessary to defend the honor of their word-processor, communications terminal program, or hardware platform since day one. The debates have simply moved inside. Instead of taking place in highschool parking lots or the Big Orange drive-in, they've moved into cyberspace. The jihad underway between Microsoft and IBM exceeds anything we've seen in the industry before.