AppleScript: Save Clipboard to Text File

This AppleScript will open a "Save as" dialog, which lets you specify a folder and filename, using the folder of the front-most Finder window as the default folder. It will then save the (text) contents of your clipboard to that .txt file.

tell application "Finder"
	if (count of windows) > 0 then
		set theDefault to the POSIX path of ((folder of window 1) as alias)
		set theDefault to path to desktop
	end if
end tell

set resultFile to (choose file name with prompt "Save As File" default name "paste.txt" default location theDefault) as text
if resultFile does not end with ".txt" then set resultFile to resultFile & ".txt"
set resultFilePosix to quoted form of the POSIX path of resultFile
do shell script "pbpaste > " & resultFilePosix