Basically, you can get the fans to clean itself (and test). It's a little-known built in feature on the 40GB PS3's (Yeah, only works on 40GB)
Tried it on mines just now, it works. Pretty nice. I remember having to use my vacuum cleaner/air can to get rid of the dust on my PS2. I thought I'd have to do the same for this, but looks like I don't
Video:
Tried it on mines just now, it works. Pretty nice. I remember having to use my vacuum cleaner/air can to get rid of the dust on my PS2. I thought I'd have to do the same for this, but looks like I don't
Video: