JCE Editor by Ryan Demmer is an alternate WYSIWYG editor for use with Joomla!  It has a number of plugins and extensions to allow use with other people's add-ons, and has the distinct advantages that it picks up the styles from your own template, and has a cunning system for easily linking to external or internal items.

  

MassContent allows you to set up quickly a series of Joomla! sections, categories and articles from a single screen and instantiate menus to display them.

  

GoogleMaps from Jan Sangill allows you to set up multiple categories and links within Google Maps so that you can map out more or less anything. Locations can be grouped into categories and a custom image and description applied to each one. Categories have a "base"  map layout (centre, style, zoom) but menu items can be used to override this and show each collection of locations in any style available.

You can see how I have used it on any of the map pages such as the Southwestern USA Itinerary map.

  

Include Content Item from kksou allows you to load any content item into the body of another, whilst also checking you don't build recursive calls. One for the purists.

  

Menu Autogenerator generates menus into a module automatically for all articles in a section or category. It simplifies the process of creating internal links because once you have set the module up it automatically picks up new content.

You can see it in action in the diary and gallery links on the La Rochelle 2009 page.

  

The RSseo plugin from RSJoomla.com allows you to define keywords and metatags for your menu items on top of the Joomla default of assigning them to articles. this gives you a little more power and flexibility, for instance wherever you want to maintain constant keywords and metatags for a section or category blog with rapidly changing content.

  

Google Verify plugin makes it simple to use the Google Webmaster Tools site verification. It adds the "Verify" meta tag to the home page - just get your verification from Google and enter it into the plugin parameters.

  

Twitter Feed is a simple module that displays a configurable number of updates (Tweets) based on the Twitter Search API. The result is a powerful module that enables you to have a great deal of control over which updates are posted to your website.

Want to filter out certain hashtags? No problem. Want to only display items with links? It's an option. Want to apply a custom CSS styling to the rendered links? Tweet updates are rendered is CSS-friendly DIV tags and can be easily styled to fit the look and feel of your website.

You can see it in action on Kev and Kas's pages.

  

Remository Glossary, written by Martin Brampton, is a toolset which allows you to list definitions of key terms within your website. Wherever these terms are found in your content a pop-up will appear showing the definition.  See the glossary definitions on the Glossary page.

  

Wikibot allows you to enter "Wikitags" in Joomla! articles, which will then auto-create dynamic hyperlinks to Wikipedia articles when displayed. It allows disambiguation qualifiers and will access Wiktionary and Wikinews. It can also be set up to access custom wiki sites, not just Wikipedia.

I have used this all over, but so you can easily find one try following this link to Wikipedia itself.

  

The site uses Shape5's KitePhotography template in the "dark" style. This is not a free component.

Shape5 provide a whole range of Joomla! templates and extensions for professionals and hobbyists alike. It is a subscription only site although some of the materials are free. In my experience their products are of excellent quality and they respond quickly support and configuration questions.