I'm the current maintainer for the rubygem-wirble package. Unfortunately, it seems that wirble has been abandoned by the developers. So I've forked the code and named it Dirby [1]. I'm inviting anybody who's interested to join me in getting it fixed up and working better for Ruby 1.9, as well as to enhance the codebase.
[1] https://github.com/mcpierce/Dirby