the Forty-Second Parallel

In my short time with Ruby, I've been obsessed focused on the browser as the delivery vehicle. With the ease of development that Rails provides, this is ideal for the majority of the needs of the apps I work on. However, there are the occasional little apps that I would like to have the ability to run on the client machine - apps that need access to details about the client environment that aren't available via the browser for security reasons. So, I've started investigating GUI frameworks available for Ruby.

I've done enough client side GUI development in the past with Python (primarily using wxPython) that something like wxRuby would probably allow to hit the ground running. But, being new to the Ruby world, I wonder what other (good) options there are out there? Is wxRuby as mature in its implementation as wxPython? I have found what looks to be a fairly decent comparison of Ruby GUI toolkits. I think what it's really going to come down to is digging in and getting my hands dirty with some of the options and picking the one that works the best for my needs.