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Chances are, you're fully aware that the number-placement logic game Sudoku is massively popular. But if you've been in a cave the past few years and need evidence, look no further than the 18 (and counting) versions of Sudoku apps available in the iTunes App Store, ranging in price from 99 cents to $10.

I really hate to admit this, and it's the fault of one of my employees, Joe Wright, a true iPhone lover. Two weeks ago, I went back to the iPhone. Yes, I got a brand spankin' new iPhone 3Gs with 16 GB of storage. I thought about getting the 32GB but figured it would just cause me to buy more music and install more applications.