I worked in Restaurants for nearly 10 years, which requires all standing, usually in one place. I swear by these.
Birki : world of comfort :: Birkis Shoes Sandals Clogs Collection 2008
Anything in the Birki line will be good for you, I like the Super's. I don't know what you do for a job, but these things are incredible for standing for long periods. They look like Crocs, but are much, much better made. They are more cushioning and much more durable. After wearing them in the kitchen all day, we used to run them through the dishwasher at the end to clean them. They are waterproof, non-skid, and heat resistant. Before getting these, my back and legs would be very tired and sore. Afterwards, there is very little fatigue and no pain. I also used to put a gel insole with an arch support in them that made a difference too. Don't get Crocs, they are absolute garbage compared to these. The perforated ones are great if you don't work a job where hot liquids or chemicals can spill through the holes.