You might also want to check out Workforce Tools to request information from a wide range of additional relocation companies.
http://www.1stopmove.com offers a secure on-line database for "one-stop, instant and complete change-of-address" for $14.95. This service notifies phone and gas companies, magazines, internet providers, credit cards, and more.
http://www.naeba.org is the site of the National Association of Buyer Agents, a searchable national database of realtors which represent homebuyers exclusively (never sellers). These are high-tech and consumer-oriented real estate firms, such as http://www.homebuyeragents.com, which can deliver daily emails to clients of new homes "just in the MLS" based on unique parameters.
http://www.erc.org -- See information concerning ERelay®, a not-for-profit extranet developed in cooperation with the Employee Relocation Council (ERC). Employers, vendors, and relocation services can train on and utilize this secure site on a fee-for-transaction basis, to submit and confirm relocation orders and coordinate logistics on individual employee files.
http://www.picdata.com provides housing market actuals on 125 key cities in the U.S. and Europe with concise "need-to-know" city facts for relocating employees.
http://www.visanow.com offers complete on-line U.S. visa and immigration processing services.