A couple of weeks ago, Curt Hibbs brought up Kapsules, desktop widgets for Windows, which can be scripted with Ruby. At the time, the site was down for an upgrade. And, now it’s back.
Looks like there are about five widgets written in Ruby, including KapMeteorology (pictured to the right.) You’ll need ActiveRuby to make use of them.
The scripting resembles a lot of other GUI libraries like FOX. A bit simpler I guess.