Ask HN: What programming cookbooks would you be interested in?

I'm wrapping up the first release of my latest project CodeGofer: http://codegofer.com and need some input on it

Essentially CodeGofer is a searchable library of programming cookbooks (collections of pre-selected snippets) for Mac OS X

I've already put together three collections on subjects I am personally interested in but before investing further efforts I'd like to get opinions from community more diverse than one developer :) So I'd appreciate your answer here in comments or on the website.