Fashion Retailer Bluefly Selects ATG Commerce.

Leading Site for Designer Brands at Discount Prices Selects ATG's Market-Leading Platform for Personalized E-Commerce, Merchandising

CAMBRIDGE, Mass. -- ATG (Art Technology Group, Inc. NASDAQ: ARTG), the leading eCommerce platform vendor, today announced that Bluefly, Inc., has selected ATG Commerce to re-launch its online store and drive a more personalized approach to selling designer fashions to a rapidly expanding base of customers. By implementing ATG Commerce, ATG Merchandising, ATG Commerce Assist and ATG Campaign Optimizer, Bluefly will bolster its eCommerce presence and provide customers with a personalized and relevant shopping experience for easily navigating through the retailer's impressive catalog of more than 350 top American and European designers. After a thorough search, ATG was selected because of its reputation as market leader in targeted personalization and expert content management, as well as for providing personalized customer interactions while still empowering Bluefly's own marketers and merchandisers.

"As our customer base continued to grow, we needed a solution that could better support our efforts in offering customers a more consistent and customized shopping experience. We also needed to create a more flexible, reliable and robust platform to deliver the functionality to increase sales and drive customer loyalty," said Marty Keane, SVP of E-commerce, Bluefly, Inc. "It became clear that our current platform needed to be updated and ATG was the obvious choice. With ATG Commerce, we can focus our marketing and merchandising efforts on giving customers what they want and having enough flexibility to introduce and add new styles each day without compromising performance. As an added benefit, with ATG's eCommerce suite, we're able to track the results of our campaigns, which allows us to continually test and better understand our customers' preferences."

After integrating ATG Commerce, Bluefly.com will re-launch its site, propelling the eCommerce leader to the forefront of savvy retailers using cutting-edge Web technology to deliver a seamless, engaging experience to online shoppers, as well as its trademark fashion features, "news-you-can-use" spots and timely fashion tips.

"ATG has proven to be the top choice for sellers who want to make the most of their presence selling on the Web," said Cliff Conneighton, senior vice president of marketing, ATG. "We're proud that Bluefly recognizes the importance of delivering powerful eCommerce capabilities while maximizing their business investments. This, once again, demonstrates our ability to provider top retailers with the versatility, strength, and customization abilities that they need to differentiate themselves within the marketplace."

About Bluefly, Inc.

Founded in 1998, Bluefly, Inc. (NASDAQ SmallCap: BFLY) is a leading online retailer of designer brands, fashion trends and superior value. Bluefly is headquartered at 42 West 39th Street in New York City, in the heart of the Fashion District. For more information, please visit www.bluefly.com.

About ATG

ATG (Art Technology Group, Inc., NASDAQ: ARTG) makes the software and delivers the on demand solutions that the world's most customer-conscious companies use to power their e-commerce web sites, find prospects, convert them to buyers and ensure their satisfaction so they become loyal, repeat, profitable customers. ATG's B2C e-commerce suite is ranked the #1 current offering by Forrester Research, and powers more of the top 300 internet retailers than any other vendor. ATG's solutions are used by over 600 major brands, including Adobe, A&E Networks, American Eagle Outfitters, B&Q, Best Buy, Cingular Wireless, Coca Cola, Dell, DirecTV, France Telecom, Hewlett-Packard, Intuit, Johnson & Johnson, Louis Vuitton, Mercedes-Benz, Neiman Marcus, New York & Company, Nike, Nokia, OfficeMax, PayPal, Philips, Procter & Gamble, Rubbermaid, Smith & Hawken, Symantec, T-Mobile, Target, Urban Outfitters, Verisign, and Walgreens. The company is headquartered in Cambridge, Massachusetts, with additional locations throughout North America and Europe. For more information about ATG, please visit www.atg.com

[c] 2006 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks of Art Technology Group, Inc. All other product names, service marks, and trademarks mentioned herein are trademarks of their respective owners.

This press release contains forward-looking statements for purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995. These statements involve known and unknown risks and uncertainties that may cause ATG's actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward-looking statements. Important risk factors affecting ATG's business generally may be found in its periodic reports and registration statements filed with the Securities and Exchange Commission at www.sec.gov. Risk factors related to the subject matter of this press release include the possibility that the ATG product deployment will not be successful, on time or significantly enhance the user's Internet experience or will not increase customer revenue across brands; that those customers leveraging ATG won't have the opportunity to increase revenue and decrease future costs; the need to adapt to rapid changes so products do not become obsolete; the possibility of errors in ATG's software products; the possibility that the solution will not make customer implementations faster or more flexible or permit the customer to meet its customer-facing or infrastructure requirements; that the ATG product will not continue to be integrated with third-party applications servers or will not support all Web services enabled systems; that ATG's product strategy may change in the future; and the risks and costs of intellectual property litigation. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.