Enhanced Joomla! administration
Joomla! administration interface is "power in simplicity". It's very clean and usable. But it can be improved still be a few extensions, and some interesting functionality can be added if requiered.
The advantage of Joomlas modularity and extensibility is that you can also tweak the admin interface to add new components and modules, accessible from the interface there. Presentation of some of these I personally find very usefull and would recommend you check out.
The admin "Home" screen consists, just like the frontend, of various module positions. This makes it very easy to change, add functionality and adapt to suit your needs. All you need to do is install the new module, and configure it for display in the correct location. Screenshot of the module positions:

The most usefull ones are cpanel, header, and icons.
header position
As you may have noticed, header is quite small in terms of real estate. You'll find the "users online" indicator and "recieved messages" there by default.
Here's a screenshot with some added icons:

Proud to say, these are my own creations! The tutorial to create your own is available, let me know what you come up with! 
We have, added here:
- All Content, which links to the "all content items" screen" (yes, I know, you wouldn't have guessed..),
- Preview with Positions (frontend with module positions placement highlighted in the template)
- Preview, which provides quick access to frontend view from any page, even if the mainmenu is disabled (content editing screens). I use this for example by setting an item to "special" access, then I can check it on the live site without anyone knowing. Using this one all the time, as I was fed up with the Site/Preview/In new window submenu.. glad to find it now in the 1.5 SVN
 Some other extensions like Mossets tree also provide additional modules for this position (in icon form), very usefull for notification indicators of all kinds!
cpanel position
Now this position provides some really usefull space, it does look a bit weird with a lot of tabs, but can hold very usefull items.
Remember: you can get rid of the ones you do not used by simply clicking the state from published (green check) to unpublished (red x)!
Defaults here are:
- Logged (online users by nickname)
- Components (never using this..)
- Popular (good for the ego, and wondering why these items are and others not.. my most popular is 404, strangely..???)
- Latest Items, which I used to use all the time: start a new article, which remains unpublished because not finished. Do other stuff, then want to continue editing: just click Home / Latest, and it's right there, and you're back in edit mode in one click! Luv it!
- Menu stats: still wondering what this is usefull for.. if you know..
Now let's add some stuff here:
Brand new, very cool: hackwar's ToDo module!

Let's you create private or public items (for collab between admins, reminders etc..)
The world famous "Rated Multilingual" which I'm just finishing up before publication.

This one contains the list of your items by rating. Gotta be carefull with the parameters, because it has no pagination (glad for any help on this!!!), so if you have many (rated) items, this list could get veeeeery long!
The must-have "Unpublished items" module

This one now is my first item in cpanel, as I often start an item, then get pictures ready, upload these, and come back to edit: one click! Also nice for multi-contributor sites, as you'll get all unpublished articles here at one glance!
Notice: I have no ACL (access rights) in the code, so anyone with backend access sees this list.. handle with care!
Finally, something I probably won't publish officially as it's not very flexible, though it can be configured via parameters.
You can find it on the forums attached to some of my posts, but you'll have to look for it yourself. Introducing:
The linky module!

The purpose of this was a proof of concept for something to include for different user levels (new Joomla! usrs, intermediate, advanced), or for different link topics like security, development etc.. Just to give you ideas really (and maybe to the dev's).
Last important position: the quicklink icons!
icons position
Now for this position, I really only know one way to change anthing which is really usefull: the component + module replacement for core default called Custom Quickicons. I use it myself and really like it.

Install the component and module, configure the component by adding/removing/re-ordering the links and selecting the icons, then unpublish the default module and publish the new one! Result (notice 2nd and 3rd icons..):
As you can see, I unpublished the ones I seldom use, and added 2 of my own for quick access to the most important sections of the site.
There's another component around the rename the menu links of the main menu which I haven't used, and maybe some others I don't know about, but i hope these examples will inspire you to create something and share it with the rest of us!
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