This is awesome. I've been using SBJSON but probably will be switching over. Thanks!
YAJL is a streaming parser (with an included Document style parser) which means you can use it streaming in situations where memory constraints are tight or as a general load everything into memory parser, very handy. I'm not aware of any other Obj-C friendly streaming JSON parsers.
That's funny, I was just reading this from a Google search ~1 hour ago. HN is starting to read my mind!