I have to say that I feel very fortunate that I am in an open adoption. Because it is so open, I know my son's parents. I have come to love them. And I feel so blessed that I will still be able to see him on occasion (I'll get to fly up for his baptism in a couple months... meet all his aunts and uncles and cousins) and get to see how he's living, growing, thriving. Yes, I did grieve. I do grieve. But I wouldn't have it any other way!
And I also have to add.... that no matter what the cirsumstance of the adoption are... we, as birthparents, are all in need of positive support, regardless of how open or closed it is. Lack of support and negative support can be nothing but destructive.