Gay Marriage
California — California’s Propositiion 8 would amend the state’s constitution, declaring that marriage is just between a man and a woman.
Florida — The Florida initiative (Amendment 2) would re-write the constitution with a ban on gay marriage and domestic partnerships. 60% of the population must vote yes to amend the constitution.
Arizona — Proposition 102 amends the state constitution to define marriage as being between a man and a woman
Abortion
California –Proposition 4 requires teens seeking an abortion notify their parents
South Dakota — Measure 11 attempts to ban abortion except in cases of rape, incest and life of the mother. The measure violates Roe v. Wade but proponents hope the measure’s passage could instigate a Supreme Court overturning Roe.
Colorado — Amendment 48 defines personhood at conception. It would ban abortion and may also ban certain types of birth control.
This site seems to come from a liberal direction but has created a comprehensive database of initiatives by state.