IE users that do not have Quicktime plugin can't see png when there's a url link to them : when clicking on the link, they get the Save dialog box that normally comes wit octet/stream mime type.
A solution to that is to point to an HTML wrapper :
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<html><body><img src=www.somehere.com/image.png></body></html>
What I suggest is to add a small php script to the forum directory for this purpouse : it would just take the image url as parameter, check that it's correct an not some malicious javascript code and output the wrapper.
Link to images would just be specified by nice users as
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[url]wraper/www.somewhere.com/image.png[/url]
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[url]www.somewhere.com/image.png[/url]