This is a guideline for how to layout your tutorial posts.
Title section of posts - This section is optional, but if used should be in the following style:
[size=18px][b][u]title[/u][/b][/size]
[i]subtitle1[/i] - date
That is two blank lines below the subtitle/date line.
Section titles within posts - This would be used when wanting to split your tutorial up into sections.
[size=14pt][u]sectiontitle[/u][/size]
Images - This one is straight forward, simply using the img tag, followed by a description
[img]http://screenshot[/img]
description
I suggest hosting images on a service such as imageshack, flickr, photobucket, or localhostr, as hotlinking images from elsewhere is not good!

If you have any more suggestions let me know