Pay to Download, Virtuemart has a pay to download version, but hte reviews of that feature have not been good, if we run into issues with Vitruemart, this may be the way to go
Base Event Module, we would need to create or add an forms module to go with this for end to end registrations. they have a plug in module for this but it cost, and is reoccurring
Protect your site from different attacks, such as PHP injections, SQL injections, Flood and sometimes even from spam. JS Defender is written completely in Joomla 1.5 native model.
Low cost 19 euros
SIMGallery allows your users to create and manage their own albums and photos
could be useful for coordinators or national offices to post pics and such to their site to show whats happening in their part of the world
This plugin will notify your website admins or any email address you specify in the configuration about new content submissions in the frontend
this would tell us when people make changes to content
With ReReplacer you can replace whatever you want in your entire site.
could be useful if we have something in a lot of places that needs to be replaced
Looks very easy (you just add a tag in your content pointing to a folder containing images and you automagically have a gallery).
Only upload images from admin side though.