Here is what I had in my old booksmarks, YMMV:

http://web.archive.org/web/20120808030015/http://www.worthlessgenius.com/2009/08/18/how-to-speed-up-your-powerpc-mac/

http://www.interrupt19.com/2008/09/04/performance-speed-tweaks-to-get-more-out-of-leopard/

http://www.imafish.co.uk/articles/52-ways-speed-os-x

http://macosx.com/forums/mac-os-x-system-mac-software/277846-universalaccessapp.html

http://hintsforums.macworld.com/showthread.php?t=83269

http://lowendmac.com/eubanks/07/0312.html

http://hints.macworld.com/article.php?story=20050504012104186

http://hints.macworld.com/article.php?story=20050723123302403

http://web.archive.org/web/20100204021840/http://www.macmod.com/software-mods/mac-os/1571-leopard-on-pre-pci

http://beautifulpixels.com/macintosh/replacement-docks-mac/

That is what was tagged as Mac OS X anyway. They should be mostly Tiger/Leopard relevant.