Apple has finally announced the release date for their new OS, Mac OS X 10.5 Leopard. You can pre-order Leopard at the Apple Store with free shipping and they promise it will arrive on Friday October 26th. You can also pre-order it at Amazon. Amazon is offering a $20 rebate when you order Leopard and Parallels at the same time, and is also currently charging $20 less for Leopard than Apple is. Amazon says they’ll ship Leopard on Friday October 26th.

Check it out at the Apple Store (click here) or at Amazon (click here).
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Coding Horror offers a primer on SQL JOINs using set theory’s Venn diagrams.

Venn diagrams are a very convenient mechanism for visualizing the union and intersection of two sets. Think of each table in a database a set. This primer illustrates how various SQL JOINs between tables can be visualized as unions and intersections.

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