has_defaults Show archive.org snapshot is now a gem, no longer a plugin.
The plugin version no longer exists. Note that plugins are no longer supported in 3.2.
If you are working on an application that has the plugin version of has_defaults there is no advantage to be gained from upgrading the gem. The gem is there for you should you one day upgrade to Rails 3.2+.
Please don't use the defaults Show archive.org snapshot gem which we original forked away from in 2009. It sets defaults when a field is blank? instead of when it is nil? and this is not what you want.

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has_defaults is now a gem