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Starwood says:
Double stays. Double Starpoints. A match made in heaven.
It’s all starting to add up. Register by April 15, 2007, and every stay counts as two between March 1 and May 31, 2007, which means elite status is that much closer. For example, if you stay three times, you’ll receive credit for six stays toward Gold status, which usually requires 10 stays in a year to reach. With elite status, you’ll enjoy three Starpoints® for every eligible dollar spent, automatic Preferred Room upgrades1, 4 p.m. late checkout2 and much more. You’ll also earn double Starpoints with every stay, so you can find your own perfect paradise twice as fast.
Easy as pie.