I have high hopes for this series; I really enjoyed Peter Michaux's "Scheme from Scratch" series, from which the author says gained inspiration for his series:
It's my understanding that JSqueak was (is?) just a toy. OTOH, redline aims to be a full blown implementation of smalltalk that integrates with the jvm like jruby, scala, clojure, etc do. As you can see from the github repo, it's still pretty much a work in progress (plus a learning tutorial for interpreters/compilers).
