css_dryer is a Rails plugin by Andrew Stewart that makes putting together stylesheets for your Rails applications more efficient than ever before. It supports nesting and basic variable interpolation. For example, here's an example of nesting:

Given the audience that Ruby Inside has, I think there's a potential for us to make some big changes in the Ruby world. I propose accepting some advertising and sponsorship on Ruby Inside, and in return I will publicly disclose the amounts and give all of the money back (minus any forced costs, such as tax) to the Ruby community as donation to Ruby-related projects, offered as bounties, and/or pay for even better articles and tutorials. Rest assured, it will not be money that will sit in a big pot waiting for decisions to be made. The choice of where the money will go will be influenced by Ruby Inside readers, naturally.

Dhaka is a set of tools written in Ruby by Mushfeq Khan that can generate tokenizers, parsers, and evaluators of context-free grammars (my own shabby contribution in this field was posted to RubyInside recently!). Dhaka's ultimate goal is to make a pure Ruby, flexible parser generator. From the official site:

Exactly one year ago David Heinemeier Hansson and the rest of the Rails core team (smaller back then!) unveiled Rails 1.0, the first 'production quality' release of Ruby on Rails. Alongside the release came an entirely new Rails Web site, the same as the one we're familiar with now. The next day, December 14, DHH followed up with some brief insight and wondered: "I can't wait to see where this will all go in 2006."

The JRuby team has just announced the release of JRuby 0.9.2 (download). Despite being a minor point release, a lot of things have been tweaked and added. Direct from the team:

There was no "Troll of the Month" feature in November, because I couldn't find any. December has started off strong, though, with two articles: Why Django Kicks Ruby on Rails' Collective Ass and Constructive Reasons to use Django Instead of Rails. While the first is definitely the most inflammatory, both make bizarre arguments (amongst some good ones, admittedly) and seem to be nothing but "let's bitch about Rails to make Django look better"-fests.