In response to a question someone asked me. Here is some information I had found.

Non-software option:

Just point to the folder and the size should show up in a tooltip. If it doesn’t, click Organize, choose Folder and Search Options, click the View tab, select “Display file size information in folder tips” and click OK.

Software options:

ViewFolderSize Pro:
http://www.moveax.com/en/software/viewfoldersizepro.html

Folder Size for Windows (open source):
http://foldersize.sourceforge.net/

WinDirStat:
http://windirstat.info/

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