Ayemon, A. J. Mathews, Tampa, FL. Spinnaker halyard block is clearly above the jibstay. Afterguy and sheet go to turning blocks near the stern. Looks like the pole-lift is attached to the end of the pole, not the center. That would make jibing the spinnaker difficult, but if you're cruising maybe you don't jibe all that often. Don't see a foreguy pulling down and forward on the pole. That's needed in very strong winds to hold the pole down and light winds to pull the pole forward.
Arbenture, Karl and Laura Petersen, Sacramento, CA. Looks like they're using the genoa blocks as turning blocks for the sheet and afterguy. Top of spinnaker is allowed to fly a foot or so from the mast. Some people like this technique, I'm told, and others don't.
Hulakai, Alex Cheng, San Francisco. The dark, round spot in the center of the spinnaker is for some sort of umbilical cord to help get the spinnaker down. This is related to the fact that Alex is fearless when it comes to spinnakers. See below:
Don't try this at home!