The following are both Obama and Clinton:

 s.1173 Freedom of Choice Act

Title: A bill to protect, consistent with Roe v. Wade, a woman's freedom to choose to bear a child or terminate a pregnancy, and for other purposes.

introduced on 4-19-07             Clinton was a cosponsor from the beginning.
                                                     Obama became one on 5-11-07.
it appears to still be under review.

  s.2916 Unintended Pregnancy Reduction Act of 2006
Title: A bill to amend title XIX of the Social Security Act to expand access to contraceptive services for women and men under the Medicaid program, help low income women and couples prevent unintended pregnancies and reduce abortion, and for other purposes.

introduced by Clinton 5-19-06 it has 12 cosponsors.
                         Obama IS one of them from the beginning.
(I think this became s.1075, which Obama does NOT cosponsor.)

 

s.20 Prevention First Act
Title: A bill to expand access to preventive health care services that help reduce unintended pregnancy, reduce the number of abortions, and improve access to women's health care.

Introduced 1-24-05             Clinton cosponsored from the beginning
                                                Obama cosponsored as of 2-8-05

Became s.21
Title: A bill to expand access to preventive health care services that help reduce unintended pregnancy, reduce abortions, and improve access to women's health care.
                                               Both Clinton and Obama cosponsored since 1-4-07  

s.res.162
Calls on Congress, on the 40th anniversary of Griswold v. Connecticut in which the Supreme Court held that married people have a constitutional right to use contraceptives, to take steps to ensure that all women have universal access to affordable contraception.
introduced 6-7-05                cosponsored by Obama and Clinton from the beginning.  

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The following are just Clinton:

 s.1264 Compassionate Assistance for Rape Emergencies Act
Title: A bill to provide for the provision by hospitals of emergency contraceptives to women, and post-exposure prophylaxis for sexually transmitted disease to individuals, who are survivors of sexual assault
Introduced on 6-16-05               Clinton was a cosponsor from the beginning (there are 11 co sponsors)
                                                       Obama is NOT one. 

Became s.1240 I believe…

Title: A bill to provide for the provision by hospitals receiving Federal funds through the Medicare program or Medicaid program of emergency contraceptives to women who are survivors of sexual assault.

Clinton introduced on 4-26-07
Obama is not a co-sponsor
There are 7 co sponsors at this time  

s.res.485

Title: A resolution to express the sense of the Senate concerning the value of family planning for American women.
Calls for Congress to: (1) help women, regardless of income, avoid unintended pregnancy and abortion through access to affordable contraception; and (2) support programs and policies that make it easier for women to obtain contraceptives.

introduced by Clinton on 5-22-06.
It is co-sponsored by 17 other senate members and is still under review.
Obama is NOT a co-sponsor.

s.1075  Unintended Pregnancy Reduction Act
Title: A bill to amend title XIX of the Social Security Act to expand access to contraceptive services for women and men under the Medicaid program, help low income women and couples prevent unintended pregnancies and reduce abortion, and for other purposes.

introduced by Clinton 3-29-07 to prevent unwanted pregnancy and abortion.
It is cosponsored by 8 other senate members and is still under review.
Obama is NOT a cosponsor.

S.2108 Emergency Contraception Education Act of 2007
Title: A bill to establish a public education and awareness program relating to emergency contraception.

Introduced 9-27-07                         Clinton is a cosponsor from the beginning     
                                                            Obama is NOT a cosponsor

  
s.844  Family Planning Services Act
Title: A bill to expand access to preventive health care services that help reduce unintended pregnancy, reduce the number of abortions, and improve access to women's health care.

introduced by Clinton 4-19-05 with 2 cosponsors.  
Obama is NOT one of them.
It is related and linked to s.20 

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Obama has not introduced anything of his own to support pro-choice.