Act Now! Quick--add urgency to your marketing, and watch your sales take off.

Better stay up late to buy from e-tailer Woot. The site posts onlyone item per day. When the limited supply is gone, you're outof luck until a new item is posted at midnight.

"If someone is looking at something, a 24-hour period ismore than enough time to consider whether or not to buy it,"says Matt Rutledge, 33, founder and CEO of the Carrollton, Texas,company, which features everything from electronics to toys toaccessories. The limited availability and discounted prices makemost of these items impulse buys, he says.

Limited-time offers are essential marketing strategies forretailers, says Bill Glazer, founder of BGSMarketing.com, a Towson,Maryland-based marketing system for retailers.