The Dimdim folder needs to go in /mod, not /blocks.
Make sure you're getting the appropriate Moodle integration from DimDim - http://sourceforge.net/project/showfiles.php?group_id=176809 - and you'll have to have a DimDim server set up to connect to, or connect to theirs.
Thanks,
Matt
Blocks
dim dim is not integrating in my moodle :(
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