Adoption at least provides chance for something good.
Personally I think that adoption should be made simpler and that gay people or anyone else lacking a certain kind of criminal record should be able to adopt. Making adoption easier ensures that orphans will get parents. And as much as the religio-psychos may disapprove of certain lifestyles, having parents that care about you is better than not and certainly beats being aborted. Taking out the possibility of a kid being stuck in an orphanage or pushed through foster homes makes adoption a more attractive alternative and kills the whole "adoption is cruel" argument.
Pro-lifers should be pro-adoption. And I think instead of pointing out pictures of dead fetuses, it would be more productive to show potential aborters positive alternatives.

__________________
"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside