NOTE: This thread listed many forum shortcuts but the info was all over the place so I rewrite it completely to make it easier to read.<br>
<br />
<table border="1">
<tr>
<td><b>Description of shortcut</b></td>
<td><b>Shortcut</b></td>
<td><b>What it does</b></td>
</tr>
<tr>
<td>To link to a Wikipedia user page</td>
<td>
CODE
http://en.wikipedia.org/wiki/User:Jimbo Wales
</td>
<td>
http://en.wikipedia.org/wiki/User:Jimbo_Wales</td>
</tr>
<tr>
<td>To link to a Wikipedia article</td>
<td>
CODE
[wp]Wikipedia[/wp]
</td>
<td>
Wikipedia</td>
</tr>
<tr>
<td>To link to a Meta page</td>
<td>
CODE
[metawiki]Metawiki[/metawiki]
</td>
<td>[[
m:Metawiki]]</td>
</tr>
<tr>
<td>To link to a MeatBall page</td>
<td>
CODE
[meatball]WikiPediaIsNotAnEncyclopedia[/meatball]
</td>
<td>[[
meatball:WikiPediaIsNotAnEncyclopedia]]</td>
</tr>
<tr>
<td>To link to a Wikitruth page</td>
<td>
CODE
[wikitruth]Press_reports[/wikitruth]
</td>
<td>[[
Press_reports]]</td>
</tr>
<tr>
<td>To link to a Wikiquote page</td>
<td>
CODE
[wq]User:Poetlister[/wq]
</td>
<td>
User:Poetlister</td>
</tr>
<tr>
<td>To link to an Encyclopedia Dramatica page</td>
<td>
CODE
[ed]tl;dr[/ed]
</td>
<td>
tl;dr</td>
</tr>
</table>
<br />
Also, there is a handy dandy
BBCode guide.