Here are links to some useful sites/pages. I will add more as and when I come across them. Note: All links will open in a new browser window.
Audio related
sound-au.com - Elliott sound products website, with lots of audio projects, articles and debunking of audio charlatanry.
www.linkwitzlab.com - Siegfried Linkwitz's website, articles and notes on speaker building techniques, sub-woofers and high-accuracy audio reproduction.
www.electro-dan.co.uk - Electro-Dan, DIYer's website. Has a wide spectrum of projects from audio to micro-controllers.
Other
www.skepdic.com - The Skeptic's dictionary website, for lots of information about things seen from a skeptic's point of view.
Bhagavad Geeta - A layman's understanding - My understanding of the subject.