Dust is a recurring problem for anyone willing to open a computer case. No matter how careful you are with your computer's environment or conditions modern air cooled systems are eventually going to need the dust cleared out.
The normal route for this hassle is to take a can of compressed air and spray the computer out. These cans are $3.50 per can and you might get 3 cleanings out of a can, if things aren't too dirty and you dont try to actually really eradicate the dust. But I like to really clean things, so I would be lucky to get 2 cleanings. That gets expensive fast.
Two common solutions that I've personally used are Vacuums and Air Compressors. Unfortunately vacuum cleaners can build up static and air compressors often spray water or oil instead of just air....Internet proof here.. Of course with my experience working in a shop I've seen water spray out of the air system plenty of times.. Dunno about the vacuum=static thing. I love my shopvac, better not to risk it though.
So what to do?
This would work great. It's portable and from what I understand the same hookup as a paintball CO2 can. So you can avoid the big box price for a new can. You can get these cans here and I've heard refills at a paintball store are only a couple of dollars (more internet proof). I had always hoped if I could work out the right set of adapters and regulators I could get under lowes' $90 price but in looking into it tonight it looks like a regulator is about $40 and the can is $10 and add in more fittings/adapters and it could easily reach Lowes' price.
Although this instructable is an interesting setup. But less portable than I would like for blowing out computers.
SO that brings me to what brought this whole blog post on...
Hardocp is urging everyone to clean their PCs this weekend. I was gonna post in the comments that I just did last week before I finally got my desktop installed in my house. In the comments I found a reference to the ED-500.
The ED-500 is a 500W electric blower designed for blowing out electronics. Looks like the best way to go. Glad to finally have that resolved. :)