How to delete saved versions in Mac OS X Lion The new Versions feature in Lion stores old versions of the document I'm working on in case to revert back to some older version of the document.  However, how can I delete the version files for a given document?

There're hidden files in the /.DocumentRevisions-V100, but I'm afraid I cannot just simply delete that folder.
If you want to delete old versions from a document directly:


Click besides the document name in the window title to access the version history
Time-machine like view opens, with document history on the right hand side
Clicking on the same menu as in step 1 in a history version will allow you to delete just this version
Option-Clicking will allow you to delete all history versions at once