I just published ebook as an Apple ibook. I should have the Kindle version up soon.
I am also close to having the alto version done.
It's a collection of 10 etudes I wrote for myself in order to study how to improvise on Giant Steps. I also include an exercise that I took from each etude based on the first chord cycle of descending major 3rds that occurs in the first half of the tune. The etudes are in the tenor key and I wrote the exercises out in all keys.
I found these to be helpful both for my technique and for my understanding of how to navigate through those changes. I still practice them because they are deceptively simple, but can yield some good results. I play them in 4 and 8 bar segments.
Here's the link. You can down the first etude and exercises for free as a sample.
Even if you aren't interested thanks for reading this far!