One of my favorite things: a collapsible trivet|
Probably my favorite kitchen _technology_ is cast iron pans - both plain and enameled.
My favorite kitchen _tool_ is my rice cooker. Over 30 years old,
as plain as they come, and it just works.
We do love our cast iron pans. And I was having trouble keeping the big ones seasoned, but lately I've started using a mix of butter and olive oil, and that seems to work better than straight vegetable oil. Something about animal fat, I'd guess.