type nul > something.blabla
:: those people down there are idiots
type nul > README.txt
type NUL > EmptyFile.txt
# also
echo. 2>EmptyFile.txt
copy nul file.txt > nul # also in qid's answer below
REM. > empty.file
fsutil file createnew file.cmd 0 # to create a file on a mapped drive
nul > FILENAME.EXTENSION
echo some text here > file.extension
$null > filename (including the $)
copy NUL > temp.txt
echo. > "myfilename.fileextension"
exit > C: ext.txt