It’s been a long time since I’ve properly cleaned my DSLR camera, and I aim to change that shortly.
Behold: Giotto’s Rocket Air Blaster. It comes favorably reviewed, and is the least invasive way to clean dust from the sensor of an interchangeable-lens camera.
I ordered the medium size (~$9, Amazon.com), though a large size (~$12, Amazon.com) is also available.