Helpful hints for thank you notes

For my children's Bar and Bat Mitzvah, I printed large clear labels with all of the guests names and addresses on them.  When they wrote their thank you notes they simply placed the coordinating labels on the envelope and it was addressed beautifully in a script font that was legible too.  It also was a good guide to be sure that you didn't forget anybody as their label would be left.  My children are wonderful and write the notes but addressing the envelopes were like pulling teeth - this was much better.