All,
I really don't check the forums but a friend hit me on the head recently saying my new series (OCATT) got a mention on here (woohoo!). It stands for "Old Croton Aqueduct Tribute Trail" and is very close to completion (currently ~100 published, with ~30 left to go). Located in Westchester County New York, just north of New York City, it was inspired by the Stud Mill tribute series in Maine placed by Ekidokai. He tributed Maine cachers while I tributed ones who geocache in my county. It's not P&G's like ET or most other "power trails". This one makes you hike, snowshoe, x-country ski, or bike the trail in order to find them. They're all really hidden instead of laying out in the open, with personalized writeups and special care taken to create them. Test tubes, zip ties, camo tape, and spray paint are my friends. The trail itself goes through scenic vistas and urban developments... it's an impressive blend of landscape that can be traveled in 1 day via bicycle, but definitely not cached in 1 day. Besides, if you're trying to fit in as many as humanly possible, you're likely doing it wrong. Check it out if you're interested in a real journey with solid caches along the way that put you to think out of the box.
FYI - the Stud Mill tribute series in Maine was done well. Each cache is 1/2 - 1 mile apart from each other, not every 528 feet. You're torturing yourself if you try for all in 24 hours, and it was created with intentions of being a bike-able trail anyway. It's your own choice to drive. I recently completed it in 2 days and enjoyed an excellent 3 night campout in the thick of it all with great friends. This is how OCATT should be done as well, except no camping is allowed along the trail.
Keep an eye out for future developments to my trail. Just keyword search "OCATT" and you'll get the full list. Who else would name their cache OCATT anyway?