Google maps had made another tweek to their program that I think it pretty neat. Instead of offering just what it thinks if the fastest route, it offers a choice of suggested options.
For example, I plugged in Detroit to Kansas City which someone asked about and it gave 3 suggested routes: I-80, I-94, or I-70.
Now it could still use a few tweeks, as its labels and choices aren't necessarily ideal.
The I-80 route was pretty straightforward, I-94 and I-80 to DesMoines and then I-35 south.
The I-94 route was misleadingly named, as the section of I-94 it uses is the same as I-80. What makes it different is that is uses I-55 (which would have been a better name) to go down to Springfield, and then uses I-72 and some 2 lane roads to bypass St. Louis and joins I-70 near Columbia.
The I-70 route was simply bizarre. Instead of using a logical route like using I-75 or I-69 to go south to I-70, it still uses I-94 to go all the way over to near Chicago, and then goes back east to Indy via I-65, and then uses I-70. That suggestion adds 75 miles to the other 2 all interstate options to Indy.
So its a nice idea, but hopefully they'll keep working on it and tweek it into a more accurate and useful tool.