Is anyone having difficulties with External Doc? I assume it is a little early to expect fully working External Doc (although Quick Doc links to guides and examples are working). As a temporary solution we can use Ingredients http://fileability.net/ingredients/ (an external documentation viewer for Cocoa). All we need from JetBrains is working Mac OS Services for text (menu appCode->Services).
PS. Guys, you've done great job. I've been waiting for appCode since your first announce.