I frequently have multiple Eclipse-based projects running
simultaneously, sometimes on different versions of Eclipse. I have made a
mess of a few workspaces by accidentally opening them in the wrong
version of Eclipse. To thwart my own forgetfulness, I went seeking a way
to launch directly to a workspace and found it at http://stackoverflow.com/questions/209789/starting-eclipse-w-specific-workspace.

Essentially, add the -data switch to your icon's open command, such as:

C:\eclipse\eclipse.exe -data E:\MyData\Clients\Confidential\EclipseGCDP

Give it a unique name and stick it on your Start Menu (C:\ProgramData\Microsoft\Windows\Start Menu). Makes my life a bit easier and hopefully yours, too.