BEFORE
Bits of crud started to appear on the photos coming out of my Nikon D100, so I looked into cleaning the sensor. Lots of advisors said this is serious business, not to be done trivially or you can ruin the camera. An ad for the Delkin Sensor Scope flew past my eyeballs and I bought it (for $189 from the manufacturer.)
If you're thinking about the same purchase, bear in mind that setting up your DSLR for cleaning the sensor requires specific steps. For me, it required an additional purchase of an AC adaptor (not a charger, but a power source) -- only with this plugged in will the D100 go into mirror lock-up/sensor cleaning mode.
The Sensor Scope comprises an illuminated loupe that fits loosely into your lens mount, and focuses more or less on the sensor. The kit contains a small and not very powerful vacuum, powered by USB or by the included pseudo-USB battery pack. With a brush tip on the vacuum cleaner, you're supposed to clean the fuffum and fleckies out. Then you can use the provided wiper sticks and cleaning fluid to get the sticky gack off the sensor.
For me, it took quite a while to make much progress. The vacuum did not seem to do anything. The wiper sticks are not exactly lint-free, so really careful wiping technique was required, and I went through 5 cleanings before I had gotten most of the stuff off there. Even still, the result is not perfect.
AFTER
