Hey, Jon. This was actually just answered recently:
http://groups.google.com/group/twitter-development-talk/browse_thread/thread/979d3d5bdfa06083
Basically, no it isn't readily available anymore and it would be better
to track it yourself.
Jon Colverson wrote:
Hello.
I remember seeing somewh
Hello.
I remember seeing somewhere a stat showing how many users had
authorized API access for my app, but I can't seem to find it anymore.
Is this number no longer available, or is it still there and I'm a
dunce for not being able to find it?
Thanks.
--
Jon
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Twitter developer documentation