re: Accepting a job etiquette?

This exact same thing happened to me.

Job A was dragging their feet and job B offered. I had to accept job B because I was getting laid off and couldn't wait (same situation where either you accept in a few days hours or they pull it).

The Friday before I was supposed to start at job B, job A came to bat. I accepted job A, and called job B and told them I appreciated the opportunity but had to go in a different direction. It's business, don't think they wouldn't snake you if they needed to).

Just be damn sure that you'll never be in a position to need something from Comapny A. It's just business.