Migrating your developer project from Windows 8 Release Preview to Windows 8 RTM ? If so, then download and read the linked document below. I counted 140+ tips in the document. Areas include General Porting Guidance, Windows Runtime Type System Validations, C++ Updates and Changes, WRL Updates and Changes, XAML Changes, HTML5/CSS/JavaScript Updates and Changes, COM Updates, and NameSpace changes. I was thinking of posting the TOC here for SEO, but it might be a bit too much. In any case, definitely worth a pass for any Win8 Developer.
RESOURCES
Download the doc from here - http://go.microsoft.com/fwlink/p/?LinkID=258744 . Tip of the fish to Michael Stark of Fla-WinDev for pointing this out.
30 Day Lesson Plan to Build Your First Win8 App - http://bit.ly/30tolaunch