Q:

Is there an SF use report that shows

Is there an SF report that shows the number of posts catagorized by buckets in reputation score?  I.E. how many posts coming users within each month with reputation values from 0-100, 100-1000, 1000-5000,5000-10000, 10000 and above.  
I'd be interested to see this if it is available.  If so, how do can I get a report like this.

A:

There is now.
It's not pretty, and there might be mistakes in there, I'll have to review it later.
You have to input the year, otherwise the graph looks like a mess (and I'm bad with graphs).
And it probably needs a few less joins...
But it's fast enough right now for ServerFault.
Fun little first thing I noticed, if you look at each year, the 0-100 group used to be the minority, it has steadily grown to be the most active group on the site.
Meanwhile the 10000+ group has been slowly declining (all-be-it much slower).

