[gesman]

I almost always reply with request for salary range (if recruiter has opened position).

If recruiter replies with usual salesmanship dance, such as "depends on experience" or "competitive" or alike, I usually ignore him for good.

Otherwise, if the pay range is reasonable I don't mind to communicate further, depending on my current situation.

[wikwocket]

I think this can be a good idea, just to get data points on salary ranges in your field. It's good to know the market value for what you do, to have an understanding of what you're worth. And if a recruiter tells you they are trying to fill a job with salary X, that's a pretty relevant data point.