Rules and examples are borrowed from the Yahoo! Style Guide
titleCase("don't fence me in");
"Don't Fence Me In"
titleCase("walk with me in moonlight");
"Walk With Me in Moonlight"
titleCase("what if I do, WHAT IF SHE WON'T");
"What If I Do, What If She Won't"
titleCase("the least she could do is cry");
"The Least She Could Do Is Cry"
titleCase("sales of iPod soar");
"Sales of iPod Soar"
titleCase("sales soar of iPods");
"Sales Soar of iPods"
titleCase("iPod sales soar");
"IPod Sales Soar"
titleCase("The big spender's budget how-to");
"The Big Spender's Budget How-To"
titleCase("author of how-to book on bee-keeping prone to illness");
"Author of How-to Book on Bee-Keeping Prone to Illness"
titleCase("GOVERNOR SLAMS E-BOOK ABOUT HER RE-ELECTION CAMPAIGN");
"Governor Slams E-Book About Her Re-Election Campaign"
titleCase("profits double on word-of-mouth sales");
"Profits Double on Word-of-Mouth Sales"
titleCase("audiences love his man-about-town sophistication");
"Audiences Love His Man-About-Town Sophistication"
titleCase("open your own eBay-based Boutique");
"Open Your Own eBay-Based Boutique"