I suspect that a vast majority of you already know these codes, but here's a quick'n'dirty reference for those that don't:
Colors:
[blue]Make me blue.[/blue]
[red]Make me red.[/red]
[green]Make me green.[/green]
[yellow]Make me yellow.[/yellow]
[purple]Make me purple.[/purple]
[orange]Make me orange.[/orange]
[pink]Make me pink.[/pink]
[skyblue]Make me skyblue.[/skyblue]
[lime]Make me lime.[/lime]
[navy]Make me navy.[/navy]
[gold]Make me gold.[/gold]
[silver]Make me silver.[/silver]
Text size:
[huge]huge text[/huge]
[big]large text[/big]
[small]small text[/small]
[tiny]tiny text[/tiny]
Font face:
[times]times font[/times]
[arial]arial font[/arial]
[courier]courier font[font]
Font style:
[b]bold[/b]
[i]italic[/i]
[u]underline[/u]
[sup]superscript[/sup]
[sub]subscript[/sub]
Text layout
[quote]quote[/quote]
[code]pre-formatted[/code]
Links and images
[iam]glider[/iam] will turn into: glider
[url]www.bmezine.com[/url] will turn into: www.bmezine.com
[email]iam@bmezine.com[/email] will turn into: iam@bmezine.com
[img]http://iam.bmezine.com/smalliam.gif[/img] will turn into 
Emoticons
:) or :smile 
:( or :frown 
:o or :red 
:D or :grin 
;) or :wink 
:p 
:cool 
:rolleyes 
:angry 
:eek 
:confused 
:evil 
:O or :yell 
:bme 
%/ or :braindead 
:'( or :cry 
:*) or :drunk 
<:) or :dunce 
8) or :glasses 
I) :blindfold 
:X or :mute 
:pirate 
-:) or :punk 
I] or :robot 
:* or :sour 
:P or :tongue
:[ or :vampire 
:bigmouth 
:barbell 
:cbr 
<3 or :heart 
:teambme 