First things first:
We are always ready for a demo/workshop on Linux installation.
Feel free to bring your hardware for installation to our meetings anytime.
What you will need:
Your PC (If it is a Windows XP machine then it is the perfect candidate. What exact hardware you have will determine the best distro.)
Adequate hard disk space: 10gb for the operating system in most cases plus room to grow.
RAM should be 512mb or more but we'll have distros that need a whole lot less.
Monitor/Keyboard/Mouse and your cables for power and monitor communications.
You can bring printers / scanners or whatever you think may have installation issues.
If dual booting, better to have Windows installed first.