I just watched that start again and actually it doesn’t seem quite as impressive as I remembered it, 4th to 3rd overtaking Heidfeld. He actually had an less than amazing getaway and almost lost a place to Kubica.
(It was still good before anyone gets defensive, it being his first race is what makes it good.).
It's the going around the outside of Alonso bit that impresses me. The overhead replay does the move justice. Hamilton was inches away from taking out his new double WDC teammate in their first corner. Although he would finish behind Fernando, this set the tone for their partnership pretty early.