I'll leave the profound Yom Kippur thoughts to other bloggers. Instead, I'll focus on the more trivial and superficial aspects of the holiday. Everyone needs a niche.
1. One thing I like about Yom Kippur is that there is almost no time between waking up and leaving the apartment. On all other mornings I do things like check email, brush my teeth, shower, eat breakfast, check email again, and put on shoes. On Yom Kippur I do none of these things, so there is a sense of transcending the physical world for a day. Along these lines I enjoyed abunaftali's Traditional Yom Kippur Stew, and kept up Bluegrass Pirate's minhag of placing two books on the table under a challah cover as the day's sustenance.
2. I led mincha at the dar, my first time leading YK services. Right before it started, I didn't know how I was physically going to make it through, since my mouth was dry after 23 hours of fasting. It turns out that adrenaline is an amazing thing. The fight-or-flight response did its job. The hardest part (physically) was standing straight with my feet together for the whole repetition (around 40 minutes), as my fast approached 24 hours. I held out, but had difficulty standing through ne'ilah (which I wasn't leading). I have no idea how anyone can lead musaf, which requires standing in one place for 3 hours. How does this work? I suppose the prostration can break things up.
3. This is less amusing as last year's thoughts on the liturgy, but about as significant. The second line of David Broza's song "Yihyeh Tov" is "Ha'aviv chalaf avar lo, mi yodeia im yashuv?" ("The spring has gone away; who knows if it will return?") I always knew that the first half of the line was a through-the-looking-glass reference to Song of Songs 2:11, but just realized this year during the haftarah that the second half was a reference to Jonah 3:9. Who knew that this song was so erudite?