This is a short example of a possible forum post.

I will demonstrate all the possible tags, and you can see that they are all converted correctly.
I will also demonstrate emoticons, and if you choose to you can have them converted too.

[i]hw.bas:[/i]
[code]
'Note that comments are made less contrasting than code - very nice feature, really
Print "Hello, World!"
Sleep
End
[/code]

[quote=notthecheatr]
Hey guys, let's write some code!
[/quote]

My website is [b][url]http://notthecheatr.phatcode.net/[/url][/b];  it has a [u][url=http://notthecheatr.phatcode.net/links.html]nice links section[/url][/u], among other things.  You
can also search using [url=http://www.google.com]Google[/url] to find other things.

[s]I never wrote this.  Pretend it's not here.[/s]

This is an image:
[img]testimg.png[/img]
Although this one isn't linked, it's entirely possible to make one into a link by nesting it inside a [ url ] tag.

A nice horizontal rule, just because we can:

[hr]

And of course we can change the font [font=Verdana]face[/font], [size=6pt]size[/size], and [color=green]color[/color].
We can also use [sub]subscript[/sub] and [sup]superscript[/sup] if we need to.

[b][i][u]A nice table:[/u][/i][/b]
[table]
[tr][td]1[/td][td]2[/td][td]3[/td][/tr][td][/td]
[tr][td]4[/td][td]5[/td][td]6[/td][/tr][td][/td]
[tr][td]7[/td][td]8[/td][td]9[/td][/tr][td][/td]
[/table]

We also have lists, both unordered:
[list]
[li]these[/li]
[li]are[/li]
[li]all[/li]
[li]items[/li]
[/list]
and ordered:
[list=]
[li]these[/li]
[li]are[/li]
[li]all[/li]
[li]items[/li]
[/list]

We can use the standard smilies supported by most forums - :), :D, etc.

And that's... pretty much it ;D