I can not name any currently racing, however it is very likely because he did sire many race horses. Recently a horse named Isabels Pearl was rescued from horse slaughter who is a descendant of Seabiscuit and now is safe. More here: http://www.tranquilityfarmtbs.org/news/2008-02-24-drf-hovedy.htm
Her breeding line to Seabiscuit can be read back 6 generations here: http://www.pedigreequery.com/isabels+pearl
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There are many. In the best breeding sheds, all royal blood flows together. His sons and daughters produced many great foals, and he was a magnificant sire of broodmares. There his influence continues.