Just for the record, jruby 1.1.3 has been released. Startup time is again down a bit but not overly much so. All in all, I think they are doing a terrific job. On a related note, jython has also released an alpha version of jython which is going to be compatible with python 2.5. The last bigger release of jython is already a bit old and was compatible only to python 2.2.
On the other hand, I find it harder and harder to choose between the two languages. Somehow, they seem to fill in almost the same spot, and it is only a question of community if you're more into ruby or python. In any case, if you're looking for some nice integration with java, you're going to have both alternatives soon, which is a good thing, I guess.