The ultimate newbie question: What languages should I learn?

Well, I have the same question, but from a less-newbian perspective. I've been working in XHTML, CSS, XML, XSLT, XSL-FO, etc for about 3 years now, but at a management level. I'm trying to stay current with the new technologies.

I see "web programmer" job listings abound, and they all contain a bunch of new languages I am less familiar with.

My question is this: What is a good path for a management-level programmer who wants to know more and "do" the programming of viable modern websites?

The path I see now requires some basic form of this:
- XHTML, CSS2
- Javascript
- PHP
- ASP.NET / VB.NET
- C#, C++, etc
- Database
- Dreamweaver, FrontPage, etc
- Crossover technologies: XML, XSLT, etc.
- Flash

I recognize some of this is preferential, but I'm opening the door for opinions so I can see what's best for me. What makes a hirable, good web-programmer these days - one who can manage AND do the nitty gritty?

Thanks for honest opinions.
Michael Friedman