The reason I am against it you can see in the post above "You can imagine the questions we get!" It is just too tough on the kids.
While I applaud your courage to post a minority opinion (no pun intended

), I have to ask: What exactly is so tough about being biracial? People asking questions?

I'm not biracial, but am pretty light-skinned. People I've known all of five minutes think nothing of asking me "What are you?" This has happened all my life. I guess I don't fit the typical black image, so I understand the curiosity. It isn't a big deal to me.
Seriously, how is being biracial any tougher on a kid than being covered in freckles, being overweight, having to wear glasses, etc.? Try being the first girl in the entire second grade to need a bra, then talk to me about tough.
My two biracial kids seem to be coping. Ask them what's tough on them and they'll probably say having to clean up their junk or going to bed at 8:30. I'm positive that being biracial wouldn't even make it on their top ten list of tough things.
Aside from school forms wanting me to choose one race for my kids, we just haven't experienced adverse effects. My white DH has very olive skin and hair darker than mine. In fact, DH and I have the exact same skin color. Our kids (except for DD in the summer--SPF 200 couldn't stop that girl from getting tan!) are lighter still and DS has dark blond hair. Maybe since we all have about the same skin color, we don't stand out as much, therefore we don't get the negative reactions.
Call me naive, but I prefer to think it's because there are so many children like mine that it is less of a novelty (or taboo). Interracial relationships are becoming more and more common and many are producing mixed children. Our kids are truly a mix of DH and I. Not to be clichè, but I think they have the best of both worlds, and they happen to be pretty darn cute, IMO!
Here are my little sources of controversy (circa 2003 and now):