Is Snape really Harry's wellwisher?

So after reading an article online, I've really started to pay attention on how Snape has been treating Harry. It makes me wonder whether Snape really hates Harry as much as Harry hates him? Or may be he likes him? Did Snape have a soft corner for Lily Evans? Do Harry's eyes remind him of her? What is the reason this half-blood prince behaves the way he does with Harry - neither of a friend nor a foe? How did Harry actually get hold of the Potions book that belonged to Half-blood prince? I guess the answers will have to wait until July 21, 2007!