We have two bi-/multi-racial kids. DS is Black/Hispanic and DD is Black/Hispanic/(and White?). We haven't had to use anything special other than Mustela's cradle cap treatment for either kid thus far. We primarily use shampoos from Mustela, California Baby or J&J Soothing Natural. On occasion we'll use a little bit of my hair conditioner--Africa's Best carrot or olive oil--in DS' hair.
If you haven't seen it already, I recommend the Treasured Locks website
http://www.treasuredlocks.com/blhacafa.html#child
Tons of good info for hair care. I haven't bought anything from them as I'd just rather get my stuff while shopping. But if there was a product I needed, I'd use these folks.
There's even a FAQ on biracial kids' hair :)
http://www.treasuredlocksfaqs.com/activekb/questions/168/...
Another site is
http://www.ourhair.net
To get to the forums with interesting content, you'll have to sign up for an account (free).
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So far it hasn't been that tough for DS being biracial other than the occasional twit who asks "What is he?" (yeah, I *know* what they mean but they're still a twit if they can't phrase it better) so our response is usually "He's a toddler" or "He's an American" LOL It's funny, my own parents--who never even celebrated Kwanza--suddenly have this burning urge to know what we're going to "raise them as" because it's important for them to know "what box to check",,,,,uhhhh how about we raise them as Americans? Besides, they should check more than one box, no? LOL