[thejeff]

Baalz, I suspect you've got a particular situation in mind, so those may be valid suggestions there, but I keep seeing things like this suggested for dealing with rushes.

As I understand the term, a rush is real early. First year, at least.
Flaming Arrows, Shadow blasts, etc, require quite a bit of research. Those are great mid-game counter for Minotaurs, etc, but they're hardly going to be available in time to stop an early rush.