This is a very rough guide at the moment, corrections welcome.
This method doesn't remove Windows in any way, similar to booting from CD-ROM on a PC.

1. Download tools

http://linuxsecurity.co.nz/barf/htc-linux-3rd-stage-distribution.tar
This archive contains bootloader.tar and apache_root_fs.tar.bz2

2. Install Linux onto SD Storage Card

Full Story.