Haven't seen this mentioned elsewhere. I always have my preferences set to use a shopping cart in the store. No accidental one-click purchase "oops, Apple just got richer" for me!
But the preference was mysteriously reset to use one-click after upgrading. Bug or insidious new "feature"?
I don't know about you, but I love one-click. It still prompts me for a password when I buy click "Buy song", so I've never accidentally bought anything.