I like to bike when I can, but I’m still nervous to leave it even with a U-lock around the frame. I’ve also had a seat stolen before (not even a good one), but I’m not sure if there’s anything reasonable to do about that.
What do you do to lock up your bike for commuting?

The saddle is locked with a small lock to the frame and if I leave it at the train station I put one lock through the front wheel and the frame and another through the back and frame.
The most important thing is that mine is not worth stealing.