http://www.cdc.gov/nchs/products/pubs/pubd/hestats/prelimbirths05/prelimbirths05.htm
The "final" 2004 figures also came out recently, which are sliced and diced in just about any way you could want:
http://www.cdc.gov/nchs/data/nvsr/nvsr55/nvsr55_01.pdf
The overall site, http://www.cdc.gov/nchs, has just about everything you could ever want to know about births, deaths, marriages, divorces and every other kind of vital statistic.
70 percent of blacks
45 percent of latinos
born out of wedlock