Add selected lines of text as new reminders. Asks for what list. Use as Automator service script. Requires http://applescript.bratis-lover.net/library/string/ to be a Script Library.

Add lines as Reminders

on run {input, parameters}
	set input to (first item of input)
	tell script "_string" to set input to trimBoth(input)
	set lst to every paragraph of input
	
	tell application "Reminders"
		activate
		set aList to (name of lists)
		
		set theList to some list whose name is (first item of (choose from list aList))
		
		tell theList
			repeat with s in lst
				tell script "_string" to set s to trimBoth(s)
				make new reminder with properties {name:s}
			end repeat
		end tell
	end tell
	return input
end run

Add lines as Reminders.zip