Taxpayers who cannot locate documents including 1099s, W-2s, and past year returns they have filed can request transcripts from the IRS either by completing form 4506 or 4506-t, online at:
http://www.irs.gov/individuals/article/0,,id=232168,00.html?portlet=4
Also by phoning 1-800-908-9946 (not a toll-free number).
There is a fee for obtaining a copy of a past filed return of US$57, however, a form W-2, form 1099 series, form 1098 series or 5498 series transcript is free of charge.