However, my personal opinion is to look at what's happening with Apache and Jakarta, which is a group of Open Source...
Java development applications, libraries and servers. I also would look at Eclipse, which has a set of tools for J2EE deployment and Web-centric applications. These might be the closest translation to your current skill set.
Now, if I was starting from scratch, I would tell you to start looking at LAMP. Not the thing on the coffee table at the end of the couch but Linux, Apache, MySQL and PHP, or else Python. I would say that a good exercise would be to configure an Apache server on your Fedora Core 2 box and learn how the configuration files are parsed. Generate an unsigned cert to see how SSL works. I would also take a look at MamboCMS, which is a LAMP-based content management system. It's a good example of the flexibility of an application that you can build with the LAMP technologies.
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