As a potential employee, what are some of the best questions to ask in a job interview?

If you are interviewing for a position in a public company, pull the last 10K or 10Q off their investor relations link on the website and review the Notes to the Financial Statements. These will tell you about the areas of accounting you will be managing and provide you with fodder for questions geared toward your knowledge and experience.

Then look at the Management MD&A at the front of the 10K or 10Q to learn more about what their strategic objectives are, this will help you develop intense operational questions that most interviewing you will respect and wonder where you got your prep because you will know more than them.

Ask questions about what each interviewer's expectations for the role are within the next 6 months to find out more about the projects you might be dealing with.

Ask questions about how well the team plays together and what the obstacles to success are there, they will appreciate your boldness and you will find each person has some interesting answers or perspectives. I have turned down job offers based on answers to these questions. These are the reading between the lines questions and they pretty much display all the dirty laundry especially when you are dealing with a panel or group interview, the non verbals are fun to watch.

I always ask at the end of the interview, "why did the last person leave?". If they respond disparagingly, you don't want to work there.

Good luck.