Hmm, looks interesting. My teacher at school (Toni Romandini, dunno if you've ever heard of him) is really being helpful with my improvisation skills and when I play in front of the jury at the end of second semester I plan on playing Giant Steps along with a few other songs

That song is probably the most fun I've ever had doing chord changes. Considering I'm a bit of a jazz noob, I'm really enjoying this stuff right now!
EDIT: is this it?
Coltrane changes - Wikipedia, the free encyclopedia