From: Apple - Mac OS X Leopard Sneak Peek - Xcode 3.0
"Many such Xray instruments leverage the open source DTrace, now built into Mac OS X Leopard."
Wow, I'm surprised that's not keynote-slide eligible. Maybe I'm just a sysadmin wonk at hand, but this makes me very very happy. Now I'll really get to play with DTrace at home at least, and be even more pissed that in my work life I have only terrible, terrible tools with which to work to fix problems (minus those from Sysinternals).
Update:
Another bit from the same page, Objective C 2.0:
"So compelling, Apple wrote Xcode 3.0 itself in it. Enjoy modern garbage collection, syntax enhancements, runtime performance improvements, and 64-bit support. At your own pace, since it’s backwards compatible with existing Objective-C source. Write applications more quickly with fewer bugs using Objective-C in Xcode 3.0."
Garbage collection...dying what that looks like.
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