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SecurityFocus has a great article on transparent firewalls. It doesn't cover many technical details, but it provides a great introduction to what they are, why they're useful, etc.

Read the full article.

I just came across this very informative article on creating web applets with XUL. It provides an introduction to XUL and Mozilla as a development platform, in the form of a tutorial for creating an online helpdesk system.

Now I gotta tell you, I spent a good many days playing with XUL over the summer, and it can be a real bitch to work with. However, it's a very powerful, cross-platform bitch. It's well worth learning, whether you want to create online applets, or offline applications.

Check out the full tutorial.