Thank you for reporting this bug. We will make it our priority to review this report.
[DUPE-471] 1.0 sencha-touch-debug.css Is Compressed
sencha-touch-debug.css is unreadable.
It's basically the same as sencha-touch.css (the compressed version)
I have this problem too...
Everybody does, unfortunately (it's a known and noted bug elsewhere).
While it's being fixed, it's easy enough bang the minified version through ProCSSor: http://procssor.com to get a prettified (and readable) version.