I've had and used exclusively a D-60 since April 2002. I have never cleaned the sensor. The camera did go in for repair once in Dec 2003 because it fell off a tripod (wasn't secured) and hit hard floor on Christmas day. Canon cleaned the sensor as part of their work, but I have never done it. I have not noticed any problem with sensor dust or stray particles like others with other cameras have complained about.
I tend to belong to the "if it ain't broke, don't fix it" camp. I agree w/Michael that this camera doesn't have much of a problem with sensor dust. So, I'd just shoot away and not stress over it until I started noticing a problem. Otherwise, you might just create a problem trying to fix one that's not there.
BTW, many of my shots have been printed at 16 x 20 and larger, and there just isn't a problem with sensor dust.