I'd eat just about all of them that aren't sweet. But that's only because I'm not really too fond of sweet sandwich-like things lately.
I scanned a few pages, these stand out:
Fried chicken fillet in waffles
insanewiches.com : The Soulwich Sandwich | insanewiches.com
Tuna sashimi wrapped in beef wrapped in bread
insanewiches.com : Ze Brunovich! | insanewiches.com
Pancakes with syrup sandwiching ham and cheese
insanewiches.com : The Blueberry Hamcake Sandwich | insanewiches.com