Buckminster and Subclipse Update Manager Bookmarks
From Eclipsepedia
Save the xml text below in a file called bookmark.xml. This is easier than to enter this information directly in the update manager.
<?xml version="1.0" encoding="UTF-8"?>
<bookmarks>
<site name="Buckminster"
url="http://download.eclipse.org/tools/buckminster/updates"
web="false" selected="false" local="false"/>
<site name="Subclipse 1.4.x"
url="http://subclipse.tigris.org/update_1.4.x"
web="false" selected="false" local="false"/>
</bookmarks>