Since the PDC lots of community newsgroups and discussions have opened up to discuss the Longhorn Technologies.

  • Microsoft have opened up a number of newsgroups which will have the product team guys on
  • Developmentor have opened up a Longhorn discussion list
  • Chris Anderson's blog is starting to detail Avalon Internals which looks great so far
  • The LonghornBlogs Blog Aggregator looks quite interesting

And Countless more no doubt ;-)