Well recently I read nice article on Infoworld, Here one of the content
and you know what, I’m on it right now…hahaha 
Skills in programming languages such
as Cobol, Fortran, PowerBuilder, and more don't rate
like they once did.
"Certainly the Cobol people that had a resurgence with the Y2K bug
aren't in demand," says John Estes, vice president of strategic alliances
of Robert Half Technology, an IT staffing consultancy. "Certain other
applications such as Delphi and PowerBuilder, [which were] very big in the '90s, are
no longer in demand."
IT work-force and
compensation research conducted by Foote Partners revealed that Cobol,
PowerBuilder and Jini noncertified skills were among the lowest-paying skills
in the second half of 2007. David Foote, CEO and chief research officer at
Foote Partners, says the research shows not that such skills aren't in use
today but that companies aren't willing to pay for them. "There is still a
lot of C and Cobol around, though these skills are worth very little
paywise," Foote says.
here is the detail [article]