OT: Good books on Cocoa dev? (spellcheck woes)

[Ian Wood]

I've got an app coming up which is Mac-only and will involve a lot of  
text entry where spell checking is critical (photographer's metadata  
entry) - no matter which way I look at it the various spellchecking  
workarounds/stacks for Rev just won't cut it as there's no way to make  
them look native enough and keep good performance. although I'd love  
to be proved wrong on that...

So, can anyone recommend a good starting point for Cocoa, for someone  
who's never been past 'Hello World' in XCode? ;-)

Ian