It’s cool to see the various JCR implementations evolve and grow. The JCR 1.0 standard is less than three years old, and there are already a number of independent implementations, both open source and commercial.
So far we’ve seen little cooperation (apart from JSR 283) or even much direct competition across the implementations, as I guess everyone is just busy grabbing market-share from pre-JCR vendors. But I wouldn’t be surprised if we started seeing more benchmarks and feature comparisons on JCR repositories already during this year. I expect it to be fun!