Accelerometer

Using atan2 for orientation
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1208368036
http://bildr.org/2011/04/sensing-orientation-with-the-adxl335-arduino/

Saxophone Intonation

http://www.ryanjanus.com/articles/intonation.html
http://www.steveduke.net/pdf/steve_duke_mouthpiece_placement.pdf

Artificial Intelligence

http://www.gamedev.net/topic/592473-recommended-ai-books-and-sites/

Matrix/Quaternion FAQ

http://www.flipcode.com/documents/matrfaq.html

http://www.ogre3d.org/tikiwiki/Quaternion+and+Rotation+Primer

Soprano Mouthpieces

http://www.sopranoplanet.com/

Property

http://www.globrix.com/
http://www.rightmove.co.uk

http://www.houseprices.co.uk/
http://www.nethouseprices.com/

http://www.home.co.uk/ <- buying guide