if you truly want to get rid of the dust, get an ionic breeze ( or whatever the heck it is called) or some kind of filter. however, the ionic thing is not cheap. I had an aluminium fan filter that i bought from xoxide.com, and after awhile (i don't remember how long) there was so much dust on it that the airflow was restricted to the point that my cpu reached the temp limit and automaticlly shut down. also, my cpu fans pulls 75 cfm, so that is why i need to clean the filter often. i got fed up with it, and took them off.
AMD Athlon XP 2500+@ 200x11 - EPoX 8rda3I - Thermaltake 420watt silent PSU - 2x512MB PNY PC3200(DualChannel) - TT HSF - PNY 5900SE, 128MB DDR, 256-bit - - Toshiba SD-R5002: DVD-RW - NEC DVD-RW - 2 Antec 80mm fans - 1 Delta 92mm fan - 1 Antec 120mm fan- 1 TT 120mm fan - Windows XP Pro - WD special edition 80GB 7200 RPM- Seagate 80GB 7200 RPM 8MB cache - Onboard Sound - Onboard Ethernet
ACER Travel Mmate 4000LCi - Intel Pentium M 710 - 15\" XGA TFT - 512MB DDR333 - 40 GB HD - DVD-rom/CD-RW Drive - WLAN 802.11b/g - Winxp Home - Intel Extreme Graphics - Average Battery Life: 4-5 hours - 6.4 lbs