Copy a folder and retain its permissions:

xcopy c:\\sourcedir c:\
ewdir /o /x /e /h /k

For command-history in DOS press F7

Grep for Windows:

type file.txt|find "search text"

Files can be dragged and dropped onto the command window for their full path to be inserted.
The native equivalent of TreeSize for DOS:

tree c:\\ >ctree.txt

Rename the title bar of the DOS Window:

title "new title"

See Also