I just do that too, just run the vacuum cleaner trough the openings in the back. That's what i've done with every console i've had, and even the NES is still working :hehe:
And PC too, though i do open up the case occasionally and clean there too. A lot less with the new case that has a dust filter in the front.
Funny, somewhat related story, my PS2 slim wouldn't read dual-layered DVDs. I vacuumed the air vents in the back and front, and it started working perfectly. I'm still