I've been buying and reading a lot of tech books lately on the following topics:
I wonder how long it will be until O'Reilly publishes this one… 
I've just added a fairly comprehensive round-up of perl fundamentals to Paddypedia. Useful for me because I'm getting heavily stuck into some WebGUI custom Wobject development which is all perl-based.
This is part of a series of simple Java applets that I wrote in 2004 when I was doing a computational physics subject. There's nothing too pretty here, just proof-of-concept sort of stuff. The source is included if you want to play around with any of the applets.
Intro
This one was just a bit of fun. I had a really crap 3rd year lab where they got us to tinker with a solar system model written in C. I thought I'd write my own version in Java. Not much advanced physics going on here, just the basic iterative approach to the many-body problem.
Interactive
You can run the applet here
This is part of a series of simple Java applets that I wrote in 2004 when I was doing a computational physics subject. There's nothing too pretty here, just proof-of-concept sort of stuff. The source is included if you want to play around with any of the applets.
Intro
In this project we extend the quantum spin chain model into two dimensions. To recap, a quantum spin chain is a one dimensional lattice of quantum spin sites, where each site can be either spin up or spin down. By extending the model to two dimensions we create a mesh of spin sites. This is known as the Ising Model. We constrain our model so that sites can only interact orthodonally with their nearest neighbours (see Figure 1).
Documentation
You can view the full report here
Interactive
You can run the applet here
Source
You can view the full source here