This article The Closet JRubyists is exactly what I hoped to hear about JRuby, and I might even point to the future of Ruby and Rails. Consider what Sun now has to offer Rubyists, all for free :

1. Solaris OS, with its builtin virtualisation
2. GlassFish, their JVM
3. MySQL, now their database
4. JRuby, with its access to the universe of Java class libraries, performance now faster, more memory and database connection efficient than MRI
5. NetBeans - highly underrated IDE with possibly the best Ruby support.

What more could we ask for ? Of course there are many other alternatives outside to most of these items, but its interesting to note this full stack offering from a company like Sun for the Ruby community, and when the whole stack comes from one vendor, they are more likely to take responsibility for integration issues.