I've used Windows Explorer day in, day out for many long years, and one thing that has bugged me all that time is the blank space in the "Size" column next to a folder in details view. One workaround is to view the Properties dialog of the folder which will show the total space used, including all files and sub-directories. Another is the excellent (but now no longer free, apparently) TreeSize program.
But now I don't need either.
Thanks to fellow DNJ Scott Munro, I now have a "Folder Size" column in Windows Explorer, courtesy of the Folder Size for Windows SourceForge project. That means I can now see...
...cool, hey?