Copy selected tasks from OmiFocus to Evernote. No error checking, written for a one-time import. Worked perfectly for my needs.

OmniFocus Taks to Evernote.applescript

tell application "OmniFocus"
    tell content of first document window of front document
		set tasksSelected to value of (selected trees where (class of its value is not item) and (class of its value is not folder))
		if length of tasksSelected is 0 then
			display alert "Select some tasks in OmniFocus."
			return
		end if
	end tell
	
	repeat with thisTask from 1 to (length of tasksSelected)
		tell item thisTask of tasksSelected
			set taskName to name
			set taskNote to note
			
			-- Create a new entry in Evernote
			tell application "Evernote"
				create note with text taskNote title taskName notebook "OmniFocus Tasks" tags "added_from_omnifocus"
			end tell
		end tell
	end repeat
	
end tell