<p>I agree with all that mzabsky said in his answer.
Here's a few of extra things:</p>

<p>I find it useful to make statements using a <code>Text</code> or <code>DisplayFormula</code> cell then manually group a Mathematica check/proof to the statement which is then collapsed and can be displayed when you want.</p>

<p>The <a href="http://reference.wolfram.com/mathematica/guide/PalettesMenu.html" rel="nofollow">Writing Assistant Palette</a> has quite a few useful constructions in it that you can learn from.</p>

<p>Finally, I found it really useful to make my own style sheet for a couple reasons:
1) the built-in ones are a bit ugly; 2) it really helps you to understand how the notebooks work.</p>

<p>To see examples of the stylesheet I made (which I don't claim to be perfect - I didn't bother making it work in all screen environments) look at some of the files in <a href="ftp://ftp.physics.uwa.edu.au/pub/MATH2200/2010/" rel="nofollow">ftp://ftp.physics.uwa.edu.au/pub/MATH2200/2010/</a>. I use a similar stylesheet in all of my notes - I have many research projects primarily contained in Mma notebooks, eg <a href="http://arxiv.org/abs/1102.3043" rel="nofollow">http://arxiv.org/abs/1102.3043</a>.</p>

<p>Like Mr Wizard, I also recommend <a href="http://home.comcast.net/~djmpark/" rel="nofollow">David Park's notes</a> as a starting point. Also, you should study stylesheets that you like by going to the Format menu and clicking "Edit Stylesheet". Don't forget to follow the links through the cascade of stylesheets (version 6 onwards).</p>

<p>To answer the questions in your edit: Once you are viewing a notebook's stylesheet, you can save it, edit it, and use it in your own documents. Stylesheets in
<code>$UserBaseDirectory/SystemFiles/FrontEnd/StyleSheets</code> are automatically available in the menu. You can then use that stylesheet in any notebook by simply selecting it from the menu.</p>

<p>The formating in the screenshot that you posted is all contained in the stylesheet. This includes the grey background in the table.</p>

<h2>Addendum:</h2>

<p>When distributing notebooks to others, if the stylesheet is external from the notebook, then other people will not see it as you do. To include the stylesheet into the current notebook, you need code like</p>

<pre><code>ss = StyleDefinitions /. Options[EvaluationNotebook[]]
fn = ToFileName[{$UserBaseDirectory, "SystemFiles", "FrontEnd",  "StyleSheets"}, ss]

If[FileExistsQ[fn],
     style=Get[fn];SetOptions[EvaluationNotebook[],StyleDefinitions-&gt;style];,
     Print["Can not find file"]]
</code></pre>

<p>(Assuming the file is in stored in the conventional place)</p>

<p>Here's an <a href="http://pastebin.com/ENLbMW9L" rel="nofollow">EmbedStylesheet.m</a> that is an improved version of the above.</p>
Using Mathematica to build presentations and documents
<p>I use Mma mainly to solve relatively small problems.</p>

<p>I want to start using it also to prepare my <strong>presentations and documents</strong>, but I am having troubles to learn how to do it from the embedded help, and I guess some good resources may be available elsewhere.</p>

<p>Do you know any useful pointers (books, papers, videos ...)?</p>

<p>Do you have a "bag of tricks" to post here?</p>

<p><strong>Edit</strong></p>

<p>This question received two answers so far (@mzabsky's and Mr.Wizard's) and although both are useful, perhaps my concerns are much more basic. So I am posting an example of the <em>kind</em> of things I am unable to do (or understand how to discern how others did them).</p>

<p>I took the following example from <a href="http://www.mathematica-journal.com/issue/v10i1/contents/graph_draw/graph_draw.nb" rel="noreferrer">The Mathematica Journal</a> (the notebook at the left on the following image - click on the image to see full size):</p>

<p><a href="https://i.stack.imgur.com/iPBRD.png" rel="noreferrer"><img src="https://i.stack.imgur.com/iPBRD.png" alt="Enter image description here"></a></p>

<p>So, some issues, just to get the idea of my troubles:</p>

<p>1) I copied the text to my .nb on the right, formatted it with the same style (text), but the appearance is different, so I guess the style definition is different. How can I copy the style definitions from one .nb to the other?</p>

<p>2) The table below the text block doesn't have an attached style. How was it formatted? Where is the background color defined?</p>

<p>I would like pointers to read (or videos to look, or whatever) about these issues. I don't want you to write down here a book on Mathematica formatting!</p>

<h2>Summary of the links posted in answers</h2>

<ul>
<li><a href="http://forums.wolfram.com/mathgroup/archive/2007/Jul/msg00914.html" rel="noreferrer">A Mathgroup thread</a> (John Browne) and <a href="http://forums.wolfram.com/mathgroup/archive/2007/Jul/msg00832.html" rel="noreferrer">here</a> (David Park and
Selwyn Hollis)</li>
<li><a href="http://bobueland.com/2008/06/14/create-a-style-sheet/" rel="noreferrer">Advice from Bob Ueland</a></li>
<li><a href="http://reference.wolfram.com/mathematica/guide/PalettesMenu.html" rel="noreferrer">The Writing Assistant Palette</a></li>
<li><a href="http://home.comcast.net/~djmpark/" rel="noreferrer">David Park's notes</a></li>
<li><a href="ftp://ftp.physics.uwa.edu.au/pub/MATH2200/2010/" rel="noreferrer">Simon's documents</a></li>
<li><a href="http://www.mathematica-users.org/webMathematica/wiki/wiki.jsp?pageName=Notebook:Tips.nb" rel="noreferrer">Tips for Mathematica SlideShow presenters</a></li>
<li><a href="http://library.wolfram.com/tips/notebookformatting.html" rel="noreferrer">Notebook formatting</a></li>
<li><a href="http://library.wolfram.com/infocenter/Conferences/7564/" rel="noreferrer">Presentations with Mathematica</a></li>
<li><a href="http://www.wolfram.com/broadcast/#Tutorials-Notebooks" rel="noreferrer">Videos</a></li>
<li><a href="http://library.wolfram.com/infocenter/TechNotes/5299/" rel="noreferrer">Tips for Mathematica Slide Show Presenters</a></li>
<li><a href="http://library.wolfram.com/infocenter/MathSource/6282/" rel="noreferrer">How to - Automatic Slide Show</a></li>
<li><a href="http://reference.wolfram.com/mathematica/howto/CreateALectureNotebook.html" rel="noreferrer">Create a Lecture Notebook</a></li>
</ul>