<a href="http://www.codecademy.com/#!/exercises/0">Code Academy</a>: for learning computer programming? Does it have Pascal? Probably not, but it's worth trying anyways.

Speaker Cabinet Plans

http://billfitzmaurice.com/">Plans for speaker cabinets for Guitars/Bass/Keys are available here.

Building a 1X12 speaker cab

http://gtr1ab.wordpress.com/2010/11/17/blue-prints-for-1x12-speaker-cab/#">Plans for the cab are here with a completed view http://gtr1ab.wordpress.com/2012/03/11/speaker-cabinet-progress/">available here.