Just wanted to remind some of you that cleaning the HTPC (or any PC for that matter) is essential to keep those babies running for a long time. I do it every 4 - 6 weeks. This time I waited 6 weeks and the amount of dust being stuck onto the filters of my HTPC was impressive. Temperature of the MB and Graph went down 2°C immediately.
While I was at it, I also cleaned my Office/ Work PC, which is always open on one side to let the air circulate and the dust collected in the fan of the GT 630 Graphic Card was close to scary. After the cleaning the temperature of all the important parts went down between 4°C and 5°C. That is a lot and proves that dusting is essential for a long lifespan.