For those of you who thought they've seen it all when it comes to election systems. Let me introduce you to the Georgia county unit system.
Georgia has 159 counties. Why? Because.
Until 1962, they had the County Unit System.
The top 8 counties had 3 representatives in the State House, and 6 unit votes
The middle 30 counties had 2 representatives in the house and 4 unit votes
The other 121 counties had 1 representative and 2 unit votes
To summarize
total - 410 votes
top 8 - 48 votes
middle 30 - 120 votes
lowest 121 - 242 votes
This system did make it pretty easy for the Talmadges to win power without carrying Atlanta or any other big cities.
The Supreme Court shot the County Unit System down in 1962 in the Gray v. Sanders decision, using the phrase "One Man, One Vote"
Just for fun.. here's some maps
The Unit system, circa 1960:

And if we had the system today, the state of Georgia would be divided as follows:

And the results for the Presidential race using the Unit System
Bush - 326 (58% of the popular vote, 80% of the unit vote)
Kerry - 84 (41%/20%)
Perdue - 296 (51%/73%)
Barnes - 112 (46%/27%)
So yeah.. The Unit System.. an American classic