Beautiful calligraphy makes my heart sing. While it is usually cost-prohibitive to use for more 'common' parties, I think a calligraphed invitation is a really amazing way to set the tone for a beautiful occasion.
When I announced my pregnancy to our family, I had a local calligrapher make a card for each of our parents and some close family members that said, "announcing the soon-to-be arrival of your first grand child" on Hello Lucky's singing blue bird card (I wanted to design something myself, but figured it would never happen if I didn't get it done right then).
Betsy Dunlap's gorgeous samples (above) make me want to come up with another excuse to use a calligrapher. But with the economy in the crapper, I think I will just be adoring these from afar in the meantime!