A year or so ago, there was a NY Times article about a several families who all had children from the same sperm donor and who tracked each other down. While they were curious to meet him (but I don't think he felt the same), they were just as curious to meet each other, to learn about the traits their children shared and commiserate a bit (I think I remember that several of the children had similar medical issues.)
When we chose a donor, I spent a lot of time trying to figure out if I would be able to locate any other children that our donor contributed to. We saw photos of two children who were born through our ED; however, they are Indian and apparently their parents intend to keep the facts of their birth a secret. Since we're leaning toward only having one baby, it would be really nice to have a connection with a half-sibling or two or three. However, as our pregnancy went on, I realized that these siblings would be located around the globe, so it might not be very useful for our child to know that he had half-siblings in Australia. But given how fast and easy global communications are, and since my blog seems to have a global reach, I'll just put this out there: if you used an ED from Mumbai named Neha, could you drop me a note at email@example.com? Maybe we'll just decide to put the information in our back pockets and not do anything about it for 5 years, but I owe it to Micah to at least ask the question.