I have a Half Sister out there Somewhere

If by some chance you can learn her place and date of borth, visit the city clerk in the place and ask for the names of people born that day. Her adopted name should be there. At least it's a starting point. Good luck.

I, too, have a paternal half-sibling that I don't even know if it's a brother or a sister. What I did was post my bdad's name on websites with my e-mail as a link. That way if s/he is looking for him, they'll at least get me. He died the year before I found his family.

We don't have the exact dates of birth.. That's part of the reason why we are stuck