It used to be consider bad form to ask about salary and benefits in the first interview. However, that is beginning to change. I've had interviews in the last two years where they ask for current salary and I ask them what they'd be offering. It's very practical in that you both get to see if you're at least a match in pay.

I don't ask right away in the first interview. I wait for the employer to ask me first and I ask them if they are willing to reciprocate. I found that some are willing to discuss it up front.