Originally Posted by Robson How much traffic would you need to make say $500/month with google?

It all depends on the amount of click-through-rate you receive. One click can range anywhere from 2 cents to 2 dollars. Here's a rough estimate of how much I earned through Google:

Impressions: 42,166 Clicks: 199 Click-through-rate: 0.5% Earnings: $25.09

This should give you an idea as to how much clicks/impressions you would need to get $500.

Note: Google Adsense pays through checks only and it's minimum payout is $100.