They called yesterday morning. had a name one letter off from my husbands name. Asked about someone in Philadelphia. They also asked if my husband and I filed our tax returns jointly. I wouldn't give them any info. Who are they?

I had a call on 12/5/09.  Caller ID himself as "Brad."  Asked for my brother who doesn't live here.  The a-hole was insistent.  Sounded like a debt collector.  Same numbers as Rick above.

The number is listed to David Landau, 4493 Lakeside Drive, Harrisburg - doing business as Goodbodies Fitness and Personal Training Center, 7458 Derry St., Harrisburg.  The fitness center is out of business.  Many of his customers are after him for fees that weren't returned when he closed.  
I believe a collection company out of Livermore and Pleasanton, CA is using the dead number to cover harassing calls.

I received a call this morning.  Asked about my neighbor...was everything ok, did I know them, etc.  All I said was that they worked full time and that I never saw them.

Oh yeah, the caller was female and she called my neighbor by name and gave me their address as well.