So, the BlackBerry PlayBook will “run” just about every app under the sun, except iOS apps.  Gruber wants to know:

Which one of these is the native SDK for the PlayBook. Which one’s best? What is RIM’s advice for how developers should write PlayBook apps?

I think it’s pretty clear that just having apps to run is what they need.  It’s why Apple included the ability to run iPhone apps on the iPad when it first launched, even though it kinda sucks.