How do you get W-2 information from a company that closed?

How do you get W-2 information from a company that closed?
If they used a payroll processing company such as ADP, you might try contacting them.

If it is for 2008, follow these procedures:
http://www.irs.gov/newsroom/article/0,,id=106470,00.html

If it is for a previous year, call the IRS at 1-800-829-1040 and they will be able to send you a copy of the federal portion. Call your state tax agency and see if they can send you a copy of the state portion.