On what issues do you buck the standard party line.

[Frodo]

-Iraq War (I support pulling out only as the Iraqi government becomes more stable, rather than based on an arbitrary timeline)

-Abortion (Roe v Wade should be overturned, and the issue of abortion should be left once more for state legislatures and/or ordinary citizens via state initiative or referendum to decide as they see fit)

-Gay Marriage (also, advocates for gay marriage are making the same grave mistake abortion-access advocates did by giving up on trying to appeal to citizens and state legislatures, and turning to the courts to impose their views on civil rights.)

-Gun Control (I see the Second Amendment as affirming for individual citizens their right to own firearms, rather than just collective entities like the state as many Democrats unfortunately advocate)

-affirmative action (get rid of it entirely)

-the permanent extension of the PATRIOT Act

-government funding of faith-based charities
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I'll add more as soon as I think of them. 

[Frodo]

The better question is on what issues do I not buck the party line....

I will answer this one regardless, though:
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Farm Subsidies -favor gradual elimination, beginning with corporate conglomerates.

Social Security -favor introducing private retirement accounts

Medicare -favor health savings accounts and the Medicare Advantage Section C that allows senior citizens to choose among various private plans for their health coverage.

Welfare -support welfare reform law passed in 1996

Medicaid -support allocation to states in the form of block grants in the same manner accorded to welfare subsidies.

Education -support school vouchers, charter schools, de-unionizing the teaching profession, and Bush's No Child Left Behind law (though with full -as opposed to partial- funding).

Environment -support expanding nuclear power.  On all other matters related to this issue, I am with the Democrats, though. 

Abortion -favor overturning Roe vs. Wade, and leaving it to the states
 
Gay Marriage -favor letting the states decide the issue as they see fit

Affirmative Action -oppose race and/or ethnic-based preferences in hiring and college admissions

Immigration -will only support amnesty once the border is secured.

Gun-Rights -oppose most forms of gun control except for background checks.  Favor the individualist interpretation of the Second Amendment.