Try the following
Wallwisher - post comments like 'stickies' on a message wall.
Slideshare lets you upload your Powerpoint presentations to a wiki, website or blog. DocStoc is similar.
Voicethread: collaboratively comment or add to a photo or resource. I'll post some more details on this when I've had a play. (That's what the holidays are for, aren't they?)
Thanks to Helena Butterfield for these.
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