MY suggestion is to be able to put in spoiler expansions and contraction tags to text or images, the benefits of this are numerous, 1. Keeping the forum clean and more organized
2. Letting users upload huge pictures but being able to keep the page clean and decent looking i.e a collection of screen shots for selling d2 and d3 items as to not exceed the 3 img per post limit
3. Hiding content that is a spoiler , so when an un expecting user walks into the thread there not blasted with plot sensitive content they will need to click the hyperlink to expand the spoiler tagged content , for tv shows anime , manga
4. There are plenty of uses for this function

To see the content you simply just click on the show button

To contract or hide the content you simply click the hide button.
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And to use it in your post you simply would do something like
[spoiler][imghttp://i46.tinypic.com/25hoho0.png[/img][/spoiler] <-- this is an example for a pic only " i left out a ] to make the image a broken link"
[spoiler] Here is the content your wanting to put into the new function [/spoiler]
instead of [spoiler] could shorten it to [spl] or what ever paul decided is he approves of this