It appears that with some work, WakkaWiki would somewhat meet this reqt's list. The search capability in Wakka is basic. The image uploading is an add-on.
An interesting side note is a fork of Wakka called WackoWiki. The main difference appears to be that Wacko expands the typical Wiki links (BumpyCaps -> Bumpy Caps) for easier viewing.
Also noticed that phpWiki has image upload capability in the CVS version, so that may be a good candidate, and it has nice search capability.
Moodle community sites
Moodle documentation: How about using a Wiki?
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