"I found a Web site, Cleaning Digital Cameras, that deals with sensor cleaning in great detail. It is quite good.
The link "Inspecting for Dust" describes a great way to take a dust-test image. This involves creating a Photoshop document on your computer's monitor, using a light colored background, and photographing the screen."
That's a lot of trouble - first your screen has to be impeccably clean, then you have to be sure you're dead on to the screen.
The easier solution as outlined above by Mark Page in his original post, myself and others... is just to photograph the sky... or even a blank, light coloured wall in your residence! No photoshop doc required!
As to using any of the home made implements illustrated on the website... you're asking for trouble. If you leave even the faintest of scuff marks, the UV filter in front of the sensor will have to be replaced - a very expensive repair and cleaning!
If you still can't get rid of obstinate dust matter stuck on the sensor, then leave it to the professionals... or suffer the consequences from a botched job!