How efficient is your system?
This could mean how much heat does it output, how much air is taken in or blown through, heat of the parts, etc.
Personally for me my system is a budget system aimed for a higher price/performance ratio.
My cooler is a deep cool cooler with dual fans. My exhaust fan has an LED light in it and is wired to blink when a system error occurs (very handy). My PSU is 80+ bronze. My CPU is always at 40 degrees C or nearby (an AMD Phenom Ii 955 BE). You get the point.
How about you guys? :D