Post images in forum? - RealWorld forums

Since I'm here asking "general" questions:

What's the best way to include a screenshot in a forum post?
Many forums use this style
[img]http://i.imgur.com/aoz47gg.png[/img]

Is there an alternative here?
Is it best to just do this: http://i.imgur.com/aoz47gg.png ?

linking to an external image is fine

if you feel adventurous, you can upload an image from your blog editor and then use it in forum post instead

I'll eventually extend the forum script, but not sure when