Article Ideas

Beginner

Getting started with Sass and Compass (this needs to be updated)
Removing code duplication with @extend (we already have one on placeholder selectors, but it's an intermediate article)
Configuring Compass
Getting to know your docs
The Difference Between Sass and Compass
Why Compass?
Compass vs. Bourbon

Advanced

Using BEM with Sass
Using SMACSS with Sass
Using OOCSS with Sass

How To / Insightful

Writing your first Compass Extension
Dynamic Color Palettes with Sass
Media-bubbling with Sass: How it works
Little used and understood Sass Functions
Contributing to Compass

Tools

Static Site Generators with Sass Support
Sass Grid Frameworks
Choosing a Grid Framework

Controversial

Alternatives to Sass: Less, Stylus, etc...
Why Sass CSS Frameworks are Better than Vanilla CSS Frameworks
Which is better: Mixin or Extend?

Sass Exhibitions

How Compass makes it easy to use new CSS3 features
Multi-line buttons with Sass
Double-Rainbow with Sass and Compass
Styling Buttons with Sass and Compass
Page curl effects with Sass and Compass
Simple CSS spinners with Sass

Sass with non-Rails environments

Using Wordpress and Sass
Using Django with Sass
Using Drupal with Sass
Using Sass for Sencha Touch projects (Guest post?)