Doug Greenberg, vice president of sales and marketing with Garde Robe, a personal valet and storage service, suggests California-based David August, which has teams of designers that meet with clients to learn about their profession, lifestyle and passions and then creates a custom wardrobe.

Kimberly Garrett of Plush Fashion Styling in New York City offers a similar service for women. Garrett, a former Ralph Lauren celebrity stylist, also helps her celebrity clients clean out their closets to get rid of outdated and unflattering items and replace them with the latest styles.

For those with too many clothes, Garde Robe, with locations in New York, Las Vegas, Southern California and Tokyo, provides cataloguing, storage and transportation services for clients' wardrobe collections. "We get a ton of folks who use us as a gift," Greenberg says. "We are like a personal valet or butler, but we don't live in your home."

Books are also prized gifts, concierges say. Coleman likes to work with Peter Harrington, a London seller of fine and limited editions that can, for example, provide an edition of Truman Capote's Breakfast at Tiffany's bound in pink goatskin leather, with a black silhouette of Holly Golightly on the cover that is studded with real diamonds. Sold in a custom-made black velvet bag, the book sells for about $4,400.

For the wealthy technofile, STRUT LaunchPort in San Clemente, Calif., offers designer protective cases and a high-tech charging system for the iPad, including covers with walnut burl, carbon fiber, leopard print and sparkle pink finishes. The centerpiece of the charging system is a pedestal made from "individually crafted, hand-welded, hand-polished, jewelry-grade stainless steel." One unit costs about $1,250.

When people's material desires have all been met, it may be time to consider getting them a gift in the form of memories. Experiences-unique vacations that can include brushing shoulders with celebrities-are among the hottest of gift items, concierges say.

"This buzzword has surpassed the trend phase," Fazio says. "The luxury market loves gifts that deliver a full experience. We have seen a significant increase in the number of experiential gifts we arrange."

Any fan of 1960s and 1970s rock music will scream for a five-day jam at rock 'n' roll fantasy camp in Las Vegas, culminating in a performance on stage with legendary singer Roger Daltrey of the Who at the MGM Grand Hotel and Casino.

For the adventurous, D1 Ultimate-GT in the U.K. creates luxury supercar driving events. The company offers a four-day ice-driving trip in Lapland, Finland, in February or March with instruction on how to control a supercar at high speeds in winter conditions. Among the cars available are a Lamborghini Gallardo, Audi RS4 and Porsche Carrera 4S.

The company also offers a 20-day Antarctica expedition that goes to the South Pole and back. The tour starts and ends in Cape Town, South Africa, and heads by air to Novo, an air base in Antarctica, for the ride to the South Pole in modified vehicles provided by Arctic Trucks.