Any artificial linking method is blackhat in Goog’s eyes. That said, some blackhat stuff still works really well until you get caught. Problem is, you WILL get caught doing it sooner or later!
So if you’re using a site to churn and burn, go right ahead and link the cr*p out of it for short term gain. You’ll rank pretty fast, make bank and then discard it when it falls.
But if you want a site to stand any chance of lasting in the long term, be careful and only buy top quality links. PS: I didn’t say that..! 