Well, most my D work this week was playing with the Objective-C binding. I filed a few bugs and Jacob fixed them, but not all made it into the release. I am awaiting the point release to do more with it, but with the understanding I have of Obj-C now, I was able to get create window in simpledisplay working on Cocoa again.
The other thing on my mind is error messages, but I am going to close this now today and write more next week. In the mean time, I suggest checking out the recent official blog post.
See more at the announce forum.