Links to IRS Forms:
Form 1040EZ, Individual Income Tax Return (PDF 105K ) http://www.irs.gov/pub/irs-pdf/f1040ez.pdf
Form 1040A, Individual Income Tax Return (PDF 138K)
http://www.irs.gov/pub/irs-pdf/f1040a.pdf
Form 1040, Individual Income Tax Return (PDF 181K)
http://www.irs.gov/pub/irs-pdf/f1040.pdf
Publication 17
http://www.irs.gov/pub/irs-pdf/p17.pdf
When in doubt as to which form to use, use Form 1040