AppleScript to create a new nvAlt note from the selected text in any app.

nvAltNoteFromSelection.applescript

-- copy selected text
tell application "System Events"
    keystroke "c" using command down
end tell

-- switch to nvAlt
tell application "nvALT"
	activate
	tell application "System Events"
		keystroke "l" using command down -- Create or Search
		keystroke (ASCII character 8) -- Escape, clear search
		key code 52 -- Return, enter note body
		keystroke "v" using command down -- Paste
		keystroke "r" using command down -- put cursor in note title field
	end tell
end tell