I like jQuery. It’s written for designers, has good documentation and examples, it’s quick to write and has an active developer community producing some nice plugins. Noupe has collated 45 plugins for your perusal but I suspect your mileage in terms of unobtrusiveness and web accessibility may vary.
Delicious links- SASS Boilerplate
- Fluid Images
- Better Image Management With WordPress
- Optimizing Error Pages
- Awkward Showcase – A jQuery Plugin
- Animatable | Create CSS3 animations
- Responsive Data Tables
- Fundamental Guidelines Of E-Commerce Checkout Design
- Tumblr Links with Post Formats
- 10 Techniques for Customizing the WordPress Admin Panel