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By Jon Brisbin, writing at the SpringSource Team Blog. See the comments section for the answers to some of the obvious questions comparing it to Vert.x.

Jafar Husain, Senior Developer at Netflix:

The Reactive Extensions library models each event as a collection of data rather than a series of callbacks. This is a revolutionary idea, because once you model an event as a collection you can transform events in much the same way you might transform in-memory collections.

I haven’t watched the interview yet, nor worked through the interactive tutorial, but I’m very intrigued by this idea and want to give it a further, in-depth study.

Chris Coyier at CSS-Tricks, writing about using async while loading JavaScript.

By Nicholas Zakas, at NCZOnline.

I especially like this bit:

An alternate proposal mentioned in his twiki is to create a <scriptGroup> element that logically groups script files together:
  <scriptGroup id="group1" ordered="true">
    <script src="foo.js"></script>
    <script src="bar.js"></script>
    <script>
      somethingInline();
    </script>
  </scriptGroup>

Though I think personally would prefer <scriptbundle> or <scriptset>.