CTAN: Comprehensive TeX Archive Network http://www.ctan.org everything a LaTeX user needs!
CPAN: Comprehensive Perl Archive Network: http://www.cpan.org everything a Perl programmer needs!
Top 100 Guitar Sites! http://www.top100guitarsites.com
Chordpack (another LaTeX based typesetting program for guitarists) http://www.fi.muni.cz/~xpolansk/chordpack/