FYI this is currently Amazon's Lightning Deal ($42.99). Just bought one b/c of this post. I believe it's normally $50 or so from BH (might as well save a couple bucks if you plan on buying one, anyway).
Can't clean the dust off a sensor with a Rocketblower and afraid to use canned air with its hydrocarbon residue? Try the Data Vac. An electric blower with a powerful air stream, and attachments for a large computer case, or a micro use such as a camera sensor.
I read about it in a camera magazine, an article by a photographer who works in dusty envionments all the time, and was tired of cleaning his sensor every day. He was, excuse the pun, blown away by the Data Vac.
I hadn't cleaned my computer case in a long while and had no canned air in the house. For what I would have paid for 6 cans of air, I got the Data Vac. It's extremely well-made, all metal, with a filtered air intake (the filter appears to be air-conditioning foam, can be removed and cleaned or replaced from the hardware store), and multiple nozzles for different kinds of work, a 12 foot cord, and a blast of air. Not so much to blow connections off harddrives, but more powerful than canned air, and twice as powerful at least as a shot from a Rocketblower.
There are several Youtube videos showing the amount of dust it will remove from a computer case. In my test, I first used canned air to remove the dust, then the Data Vac. I couldn't believe how much dust was left that the Data Vac removed. It's a matter of strength of flow. Once again, not so much to damage small or sensitive parts; for less flow you can use a wider diameter nozzle.
The advantages are pure filtered air, no contaminants, double-length cord, bulletproof construction (reviews on Amazon and B&H say it lasts five years at least and is still going strong). Downside is that it's noisey, but how long would you leave it on?
About $45 at Amazon, Adorama and B&H. Takes up as much room as two 10 oz cans of air. The black nozzle below comes off. The nozzles are held on by a spring button not seen in this photo.
Photo courtesy Adorama