What's the best place to post suggestions for Apple to read?
I always prefer this chain:


Speak with an Apple Employee - ask them who exactly is best to hear the specific feedback. Who better to know what the best channel for your idea / feedback than the people trained to interact with the public. Just be aware that not all employees will be in a position to take your feedback, but they might be taking mental notes to send it up even if they don't let on or promise you they will follow up on your feedback.
If it's really a bug in the hardware/software, you can file a bug at http://bugreport.apple.com
There's always http://apple.com/feedback