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As "rude" as it may sound... You should ask about pay increases. I got burned by not asking before taking my current job. I found out a few weeks after starting that the company has not given raises since 2008! Needless to say I regret not asking that. Also you should ask about the company and do your research. I found out the company I now currently work for almost went out of business in 2008. I obviously am searching still for a better opportunity and using this job as a "stepping stone".
Ask them for their Facebook password.
Just kidding. I would look at their website/materials and try to find out as much as possible about the business, then tailor a couple of questions based on that in case you need them. I also suggest asking them what they are looking for, something like "What are the qualities that you are looking for?" Or perhaps, "What can I do to make your decision easier? I would be happy to...."
One thing I wouldn't ask about during the initial interview is salary or vacation, particularly vacation. If you set the hook and get called back for a second interview, that is the time to start negotiating salary/benefits.
Good luck, I hope things go well!