Some resources around the web that I have found useful:
Computing
- JCreator: An excellent freeware Java IDE.
- Java: Java is a very pragmatic programming language and a beautiful example of OOP.
- Sed One Liners: Useful tidbits of sed
- Bash: intro
- Bash: intro continued
- OMG Bash Guide: Advanced Scripting
- Gnuplot: Not so frequently asked questions...
- Gnuplot Contour Plots
- Macports: An easy to use system for managing open source software on Mac OS X.
Physics
- Problem Solving Web Demos: Two UCSD graduate students/TAs present physics problems intended for undergraduates taking calculus based university physics I. Their powerpoint movies are accessible, complete and enjoyable.
- Physics Qualifying Exam Wiki: A UCSD graduate student's wiki that has not only 40 qualifying exams with solutions but also notes and study guides from our experience in first year classes.
- Sprott's Gateway: Professor Clint Sprott's website largely dedicated to his explorations in chaos, complex systems and fractals. While at Wisconsin I worked with Dr. Sprott and a couple students exploring Lotka-Volterra models of competition. Our studies included this, this, this, and this.