Target Window plugin
I wrote a WordPress plugin that will automatically add the target attribute to links in your posts.
You can specify the target window (‘_self’, ‘_parent’, ‘_top’, ‘_blank’ or user-defined) in the Options panel of the WordPress admin interface.
The plugin can be configured separately for hyperlinks linking to local pages (within in your blog) and for hyperlinks linking to external pages.
If the target attribute is already defined in your hyperlink it is not overruled by the plugin setting.
v0.2 : added support for links in blogroll (in wp 2.1 and higher).
How to install
Unzip the download.
Place the rf_target_window folder in your wordpress plugin folder.
Go to the plugins page in the WordPress admin interface and activate the plugin.
Configure the plugin in the WordPress Options panel.