You can resize very large images in posts using a variation of the IMG tag in the forum.
The Usual use of the Image BBC Code in the forum, to post a photo in a post, is like this:
[img]http://seamac.info/cupboard/garage/garden/200802/20080208upskirt.gif[/img]
Which gives us this:

But what you Don't know is that the IMG code supports width=XXX and height=XXX attributes! (where XXX is in Pixels)
Say I want to shrink some huge photo that got posted: I would do it like this ...
[img width=480 height=360]http://seamac.info/cupboard/garage/garden/200802/20080208upskirt.gif[/img]
Which looks like THIS:

So, all you moderators that run into giant photos just click modify and add width= and height= to the IMG tag and save it. I'll fix 'em all in any post in any forum I moderate. Isn't that SCHWEET?!
It is [GENIUS+] Is it Not?