### Update Beta 4 of Rails Test Prescriptions is now available, with two new chapters, one on Rcov and coverage in general, and one on writing better tests. Buy [here](http://www.pragprog.com/titles/nrtest/rails-test-prescriptions). While I'm in the self-promoting mode, the book is also available for pre-order at [Amazon](http://www.amazon.com/gp/product/1934356646?ie=UTF8&tag=10prinhell-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1934356646) and other exciting locations. ###...

### Top Story I'll mention somebody else's book, but don't worry, I plan on doing it in a totally self-absorbed kind of way. Pragmatic released [Using JRuby](http://pragprog.com/titles/jruby/using-jruby) into beta yesterday, by the core JRuby team. Looks good, interested to see where they go with it. Because I'm me, I can't...

### Top Story MacRuby 0.6 [is out](http://www.macruby.org/blog/2010/04/30/macruby06.html). Big new features include a debugger, a new interface to Cocoa's Grand Central Dispatch, and a rewrite of the internals of basic Ruby classes. In a related story, the early text of Matt Aimonetti's MacRuby [book from O'Reilly is available](http://macruby.labs.oreilly.com/) for free online....