"The maximum contribution that can be made to a traditional or Roth IRA is the smaller of $5,000 or the amount of your taxable compensation for 2011. This limit can be split between a traditional IRA and a Roth IRA but the combined limit is $5,000.The maximum deductible contribution to a traditional IRA and the maximum contribution to a Roth IRA may be reduced depending on your modified adjusted gross income."
http://www.irs.gov/retirement/article/0,,id=202510,00.html:
"The maximum contribution that can be made to a traditional or Roth IRA is the smaller of $5,000 or the amount of your taxable compensation for 2011. This limit can be split between a traditional IRA and a Roth IRA but the combined limit is $5,000.The maximum deductible contribution to a traditional IRA and the maximum contribution to a Roth IRA may be reduced depending on your modified adjusted gross income."
Also, this table seems to agree:
http://www.irs.gov/retirement/participant/article/0,,id=2025...
This is for 2011, but my recollection is that 2010 had identical wording.