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Forum Moderators: ergophobe
A plugin that allows you to manage your ad inventory through OpenX and get the benefits of that network.
Earn some proper dollars rather than Google charity (although you're still using Google).
Right now I run a Joomla site that has 3 or 4 main extensions. And another 5 or so secondary still getting set up proper ones.
For directories instead of mosets there's also SOBI2 which is useful.