After Eclipse has started, the functionality is moved into its own proper window until you close it:
I tested this on Windows XP but it should work on other platforms too. You will need a 1.5 level Java VM to run this.
(Update, April 10, 2007: Essentially the same functionality, plus lots more, is offered by the core tools. The information just doesn't appear in the splash screen :) )
Please file specific bugs if you think that too many plug-ins are activated!