Recently I wrote a small utility which allows you to play a copy of Guild Wars which resides on a flash drive or portable harddrive. This means that you can take Guild Wars with you when you travel, and play it on any computer you encounter without installing it. Just plug your drive in, launch Portable GW, and go Charr hunting! It's open-source, and written in NSIS.
I'd appreciate it if some of you (who own Guild Wars) could download and test for me. I look forward to any feedback the community offers. Thanks!