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A good one. You may want to consider to use Scott Hirsch's submission which allows you to interactively select variables from the workspace.
It gives you more flexibility than using files.
I was about to create an app and was exactly looking for something like this. Great one, thanks Scott!
A very useful function. Stopped working under R2011b (as Mark Morehead pointed it out).
Yair, do you plan to update it so that we can have this great stuff in future releases?