IMHO... and I might get laughed at for this. Everyone should have one of these.
DataVac Electric Duster 500 - White (4.5 Amps) : Target
I have one for cleaning out my PCs instead of paying for compressed air cans and it makes a GREAT double for cleaning out around the spark plugs when I do changes. No kidding. I just used it tonight actually as I was disassembling the 2V motor I have on my engine stand to blow all the crud out from areas my shop vac could not get.
It looks pricey but it doesn't freeze your hands like compressed air cans do, doesn't have anything potentially toxic in it, won't get weak halfway through the can and run out and since pretty much everyone has a computer these days these things are worth their weight in gold.
And word of advice, always blow all the crud off your motor when doing plugs FIRST and THEN remove the COPs and the plugs... Also when doing plugs do them one at a time, don't remove them all at once and then install them all at once, that leaves all 8 cylinders open to the air unnecessarily. I try to keep the time each cylinder is without a plug in it to a matter of as long as it takes to remove the old one and thread the new one in.