JQuery Cheat Sheet
Modernizr cheat sheet
A few tables etc to reference when using the Modernizr library.
Html character codes.
The most basic of unix command, helpful if you need to check a command.
Email Css Cheat sheet
Html css cheat sheet - quickly check your supported attributes.
Some Image Magick magic. Functions and ideas for what to do with images and php.
Twitter's frontend rapid prototyping framework. Really easy to use and useful framework for creating sites fast.
Less known jQuery Methods
Here are a couple examples of less know jQuery functions.