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DSpace instance list with over 500 instances worldwide: http://www.dspace.org/index.php/DSpace-Repositories/Repositories-Alphabetical.html
DSpace website forums: http://www.dspace.org/index.php/Forum/
Training: http://www.dspace.org/index.php/Training-Materials/DSpace-Training-Materials.html
The DSpace LIVE CD (allows you to download a version of DSpace to play with - for example, you use it to play w/Manakin) is under the "Overall DSpace" section.
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