Hah well its not exactly new, but we took all your suggestions and are going to try something new with roughly the same formula.
However, its going to drastically change the amount of karma you have... the 1-100 thing really just seemed to put everyone around 50. Paul teamed up with a team of statistical mathematicians from MIT to figure out a new way to tweak the formula that calculates it...
Don't be surprised all of a sudden when your karma jumps anywhere from 5,000 to a couple million points. Now, its going to fluctuate a hell of a lot more, change instantly as you rate someone up or down, and still be based on a whole bunch of metrics from around the site.
So far it looks pretty good, but we'll just have to see what happenes when its released.
Should be later today or tomorrow, so don't be surprised when you see it!