Here are some useful links. Enjoy!

Real-time PCR Tutorial

Real-time PCR Protocol

Real Time PCR Primer and Probe Database

Real Time PCR Primer Sets

IDT Primer Quest

Invitrogen OligoPerfect Designer

Invitrogen Block-it RNAi Designer

Qiagen siRNA Design Tool

Gene-quantification

PCRLinks.Com

CodeHop Primer Design