I was having a problem that occurred when I stated eclipse. I found that there where workspaces available in the drop down option that I no longer wanted to use.
Here is a step by step on how to remove obsolete workspaces from eclipse.
1. Go to your workspaces folder and delete the folders/workspaces you no longer require. If you start eclipse at this stage you will see the folders you just deleted are still available in the eclipse workspace dropdown. So close/cancel eclipse.
2. Go to the folder where the eclipse.exe lives, move to \configuration\.settings and open the file org.eclipse.ui.ide.prefs for editing.
3. In the variable RECENT_WORKSPACES=C:/blah/blah , remove the paths to the folders you deleted in step one.
4. Start eclipse and the unwanted options should not be in the recent workspaces option drop-down.
surfdev 
There is a much better way in my view: use the menu
Window > Preferences, then go to
General > Startup and Shutdown > Workspaces.
See http://mcuoneclipse.wordpress.com/2012/04/04/managing-recent-workspaces/
You are right Erich, that is a much more efficient way to do it. Thanks for the info.
thnkx buddy .. its easy and really working
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Thanks Erich..
thanks..
Thank you all!
Awesome! That works great 🙂 Thanks Erich