"A syntactically streamlined dialect of Objective-C using Clang/LLVM"

Can't download for whatever reason.

an Objective-C implementation of asynchronous inter-thread message passing

a reflective, object oriented programming language with dynamic message dispatch (late binding) and both static and dynamic typing ... uses the runtime library of Objective-C to support the Cocoa and GNUstep APIs natively

A better unit testing framework for OS X and iPhone development.

God help me if I ever need this.

Testing and mocking iPhone apps.

"a clean-room implementation of Apple’s CoreLocation framework that is part of the iPhone SDK"

"an Objective-C implementation of asynchronous inter-thread message passing"

"an Objective-C framework for regular expressions"

properties, garbage collection. etc.

A dialect of Lisp backended by Objective-C.

"In Rails (and Ruby in general), it's accepted and actually encouraged to use language tricks to reduce the total number of lines of code."

Nice summary of new language features from late last year.

A Ruby/Objective-C bridge. Yessssss.