I use Perl 5.004_04 at home on debian 2.1 and at work on both Solaris 2.6 and DU 4.0D. The main reason for not upgrading yet is basically not getting around to it. The boss/perl guru is planning on upgrading within the next week or two.

Basically, I'm of the conviction that I should upgrade whenever possible to avoid bugs/holes in old versions, and make it easier for developers by lessening the amount they have to support old versions of their software.

I think a big credit to perl is the fact that it has succeeded without having a marketing juggernaut (like MS) behind it. Microsoft is ramming c# and .NET down its developers throats, and a lot of buzzword junkies out there are buying it. Perl has developed a huge following by actually being a useful technology.

-Mark