Late to the party, upgrading from Leopard to the snowy cat, what do I need to know?

[Panopticon]

The only thing I don't like about Snow Leopard is how, when I right-click to close an app from the dock, how the whole screen goes dark. Just can't get used to that, but otherwise no issues.

huh???
on 10.6.2 here & I don't see that happening. App just closes.