Region View Modes

"A surprisingly simple, flexible layout solution made possible by placing fields in regions. Region View Modes is just a bit of glue to join Drupal's theme regions and View Modes."

Fences

Fences is a great module to clean up your markup. A must know module! As the project page says, "Compare Drupal 7’s default markup for a field:"

CKEditor

CKEditor is new favorite rich text editor however I prefer to use the WYSIWYG module because it seems to have better media module support. This module, however, is needed if you plan to use the Scald module. If unsure, then I suggest using the WYSIWYG module instead.

Panels Everywhere

Let panels take over the whole page. From d.o:
"Panels Everywhere is an advanced method to completely do away with Drupal's restrictive blocks system and instead use the much more freeing Panels Layout system to control how your pages look. Panels Everywhere modifies the page as it is being rendered to 'wrap' the content in a display and can even take over your page theme to do away with the need for a page.tpl.php."

Field Conditional States

With the Field Conditional State module you can change the state of any supported fields form element depending on the content of other fields. This is done by providing an UI for Drupal's States API. All the changes made to a form by FCS (Field Conditional States) utilize only the States API and therefore are clientside only.

Views Filter Harmonizer

Normally, when a Views field has been assigned both an exposed filter and a contextual filter, then both filters get applied to the View's results set -- always. This is not configurable behaviour. It's hard-coded.