PHP - Smart image resizer (JPG, PNG, GIF)

http://shiftingpixel.com/2008/03/03/smart-image-resizer/

Really good Jquery tutorials

http://webstandard.kulando.de/post/2008/09/12/best-of-jquery-tutorials

Creating Server Daemons with PHP

http://kevin.vanzonneveld.net/techblog/article/create_daemons_in_php/

Advanced QoS for IPCOP

IPCop is a linux firewall distribution like smoothwall or similar, but it claims to be very easy to install and maintain

IPCop itself
http://www.ipcop.org/

Advanced QoS for IPCop
http://en.wikibooks.org/wiki/Advanced_QoS_for_IPCop