[quote author="disperso" date="1292062436"]IMHO, the legal concerns about copyright on images are more or less the same as the legal concerns on text (assuming the devnet would allow to upload just PNG files, for example). The main concern should be the burden on maintaining the feature.
Since I have my own hosting, and there are plenty of specialized sites on the net that allow some hotlinking, I don't think this is of the highest priority (all IMHO, as always :) ).[/quote]
There are many thirdparty sites for hosting. But it is always better to have he images hosted in the wiki - to ensure that they don break in future.
Also copyright issue can be moderated to a certain extent - that is how other forums do. Say Forum Nokia has a very well maintained wiki - and they moderate it very well.