Scott, there are three things that have helped me:
1. Horse Stall Mats (available at local tractor supply) as they are very durable; use them in area's where you stand in a lot.
2. I also attempt to do tasks such as sanding (which can take a long time) from a seated position when feasible.
3. If you can afford it; orthotic supports (the real custom fitted kind, not the store bought junk). They hard as a rock, but actually provide significant relief when standing or walking a lot.