AAHA Solutions Drupal Development
Framework gives general placement and formatting to basic Drupal elements
Supports one, two, and three-column layouts with source ordering
Set to a 12 column grid of 960px
CSS file is highly organized, including a table of contents, section flags, alphabetical properties, etc.
Includes a CSS reset and a list of CSS utility classes
Em based text sizing with vertical rhythm
Clean and simplified code and file structure
Uses HTML 5 structural markup
Plugins -- tools to make it easy for modules to let other modules implement plugins from .inc files.
Exportables -- tools to make it easier for modules to have objects that live in database or live in code, such as 'default views'.
AJAX responder -- tools to make it easier for the server to handle AJAX requests and tell the client what to do with them.
Form tools -- tools to make it easier for forms to deal with AJAX.
Object caching -- tool to make it easier to edit an object across multiple page requests and cache the editing work.
Contexts -- the notion of wrapping objects in a unified wrapper and providing an API to create and accept these contexts as input.