Top 10 files by size, in all subfolders

dir . -r | sort Length -d | select -f 10 | ft FullName, Length

A longer version....

dir -re -in * |
	?{ -not $_.PSIsContainer } |
	sort Length -descending |
	select -first 10

As a one liner

dir -re -in * | ?{ -not $_.PSIsContainer } | sort Length -descending | select -first 10

or if you want to exclude contents of .hg folder (as we do sometimes...)

dir -rec -in * | ?{ -not $_.PSIsContainer -and $_.DirectoryName -notmatch ".hg" } | sort Length -descending | select -first 10 | % { $_.FullName + ", " + $_.Length }

Source