HEATKEYS

ESP - The Audio Pages. Professional results for the DIY enthusiast. Audio articles, projects to build and general information about hi-fi amplifiers, loudspeakers and audio in general.

Quora is a continually improving collection of questions and answers created, edited, and organized by everyone who uses it.

School for Champions provides free online explanations and lessons for those seeking personal, academic and professional success

Open source travel guide featuring up-to-date information on attractions, hotels, restaurants, travel tips and more. Free and reliable advice written by Wikitravellers from around the globe.

FlyerTalk is a living, growing community where frequent travelers around the world come to exchange knowledge and experiences about everything miles and points related.

Comprehensive home theater product reviews, tech articles, buying guides, and consumer electronics news! Get the latest equipment reviews and tech info on HDMI 1.3 A/V receivers and processors, HD DVD, Blu-Ray and more.

GoHz: Go to 50 Hz, 60 Hz, 400 Hz... AC power supply, convert mains electricity (50Hz/60Hz) to variable frequency & variable voltage power source.

Powersoft audio home page

Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.