bbcode legend:

standard tags:

standard tags are available to everyone wihtout any restriction

bold: [B]text[/B] makes bold text
italic: [I]text[/I] makes italic text
underlined: [U]text[/U] makes underlined text
strike through: [S]text[/S] makes strikethrough text
subscript: [SUB]text[/SUB] makes subscript text
superscript: [SUP]text[/SUP] makes superscript text
color: [COLOR=red]text[/COLOR] or [COLOR=#FFAA44]text[/COLOR] makes text color red or #FFAA44
size: [SIZE=80]text[/SIZE] makes text 80% of normal size
font: [FONT="Lucida Console"]text[/FONT] sets the font to courier
align left: [LEFT]text[/LEFT] aligns text to the left
align center: [CENTER]text[/CENTER] aligns text to the center
align right: [RIGHT]text[/RIGHT] aligns text to the right
code: [CODE]text[/CODE] to write code
quote: [QUOTE]text[/QUOTE] to write quoted text
link: [URL=]text[/URL] or [URL][/URL] makes a link
image: [IMG][/IMG] or [IMG WIDTH=200 HEIGHT=50][/IMG] or [IMG HEIGHT=50][/IMG] makes an image
makes an unordered list, and
makes an ordered list
smileys: [smiley]:)[/smiley] or [smiley]:P[/smiley] makes smileys
[table width=100% bg=#CCCCCC]
[tr][td] row 1 column 1 [/td][td] row 1 column 2 [/td][/tr]
[tr][td width=15px bg=blue valign=top colspan=2] row 2[/td][/tr]
makes a table

3rd party tags:

3rd party tags can be more or less restricted depending on the config of the admins. they are a safe way to allow people to add cool stuff to their posts.

facebook like button: [LIKE] embeds facebook like button in the post
twitter tweet button: [TWEET] embeds twitter tweet button in the post
google +1 button: [+1] embeds google +1 button in the post
addthis button: [ADDTHIS] embeds addthis button in the post
youtube video: [YOUTUBE WIDTH=100 HEIGHT=100][/YOUTUBE] embeds a youtube video in the post
novamov video: [NOVAMOV][/NOVAMOV] embeds a novamov video in the post
stagevu video: [STAGEVU][/STAGEVU] embeds a stagevu video in the post
tudou video: [TUDOU WIDTH=100 HEIGHT=100][/TUDOU] embeds a tudou video in the post
youku video: [YOUKU WIDTH=100 HEIGHT=100][/YOUKU] embeds a youku video in the post video:
[56.COM WIDTH=100 HEIGHT=100]
<embed src="" type="application/x-shockwave-flash" width="480" height="395"></embed>
[/56.COM] embeds a video in the post
google maps:
<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src=";ll=46.225453,-64.962158&amp;spn=3.739548,7.064209&amp;t=h&amp;z=7&amp;output=embed"></iframe><br /><small><a href=";ll=46.225453,-64.962158&amp;spn=3.739548,7.064209&amp;t=h&amp;z=7&amp;source=embed" style="color: #0000FF; text-align: left">View Larger Map</a></small>
[/GOOGLE_MAPS] embeds a google map in the post
veoh video: [VEOH WIDTH=100 HEIGHT=100][/VEOH] or [VEOH][/VEOH] embeds a veoh video in the post
hulu video: [HULU]<object width="512" height="288"><param name="movie" value=""></param><param name="allowFullScreen" value="true"></param><embed src="" type="application/x-shockwave-flash" width="512" height="288" allowFullScreen="true"></embed></object>[/HULU] embeds a hulu video in the post
myspace video: [MYSPACE_VIDEO WIDTH=100 HEIGHT=100][/MYSPACE_VIDEO] embeds a myspace video in the post
barbavid video: [BARBAVID WIDTH=400 HEIGHT=200][/BARBAVID] embeds a barbavid video in the post
vidxden video: [VIDXDEN][/VIDXDEN] embeds a vidxden video in the post
vidbux video: [VIDBUX][/VIDBUX] embeds a vidxden video in the post
gorillavid video: [GORILLAVID][/GORILLAVID] embeds a gorillavid video in the post
putlocker video: [PUTLOCKER][/PUTLOCKER] embeds a putlocker video in the post
sockshare video: [SOCKSHARE][/SOCKSHARE] embeds a sockshare video in the post
videoweed video: [VIDEOWEED][/VIDEOWEED] embeds a videoweed video in the post
divxstage video: [DIVXSTAGE][/DIVXSTAGE] embeds a divxstage video in the post
movshare video: [MOVSHARE][/MOVSHARE] embeds a movshare video in the post

risky tags:

risky tags are only available to those who have the power of using them.

flash: [FLASH][/FLASH] or [FLASH width=200 height=50 flashvars=&var1=test&var2=test][/FLASH] embeds flash in the post if you have the power to do it on this forum, otherwise it will only show a link to the flash movie
iframe: [IFRAME][/IFRAME] or [IFRAME width=200 height=50][/IFRAME] embeds an iframe in the post if you have the power to do it on this forum, otherwise it will only show a link to the framed page
<p>this is a paragraph</p>