If Copperhill is gone, that would be a shame.... good products, fair prices and good info on their website.
You can get the same products and more, the same info and more at
www.cleaningdigitalcameras.com. This extremely detailed and thorough "how to" site is maintained by the guys at
www.micro-tools.com, where virtually every sensor cleaning product is available, an who are themselves professional camera repair techs, one of whom (Larry) has literally written a lot of the books on the subject.
Sensor cleaning is a multi-step process.
First cleanings always have to be wet cleanings. This is because there is always oil on the sensor (that cause dust to stick to it). If any of the dry or adhesive cleaning methods are attempted when there is oil on the sensor it will just result in smears, contaminating the cleaning tool, and ultimately will cause dust to adhere more easily.
For wet cleaning I use Eclipse sensor cleaning solution and Pec Pads cut down and fitted onto two different sizes of tools (one for APS-C size sensors and the other for full frame). These are basically what Copperhill sold in their kits and are available elsewhere.
A puff of air from a bulb blower can chase away loose dust. (Don't use "canned air"... The most common types deliver too strong a blast and can spew liquid propellants.)
A brush such as Visible Dust's Arctic Butterfly can be useful coaxing off slightly adhered dust specks.
A low powered vacuum can be helpful pulling air borne specks of dust away from the camera, once they are loosened from the sensor.
A lighted magnifying loupe is almost a necessity to inspect the sensor for gunk and specks.
An adhesive method such as Dust Aid, with single use pads, can lift off adhered dust and traps it nicely. Speck Grabber is a reusable, precision tool to get that last stubborn speck off there. I think someone is now making a larger reusable cleaning pad similar to the "goo" on the end of the Speck Grabber, but haven't used it.
Once the sensor is clean, a Sensor Pen is used to polish the surface and remove the haze that wet cleaning fluids always leave behind. This is always a final step that will help the sensor be more resistant to dust adhering and that usually will make for longer times between needing cleaning, especially more recent camera models with self-cleaning sensors.
It's also good policy to clean the rear element and barrel of lenses... as well as the inside of lens rear caps and body caps... even vacuum out your camera bag occasionally. Use common sense, but don't be afraid of lens changes.
Cleaning sensors yourself is very doable and a good skill to learn... but also is not without some risks. Be careful working in there around the delicate mechanisms of the shutter and mirror, and the sensor itself. Repairs for mistakes are very expensive!
Also, don't use ridiculously small apertures that are costing you fine detail lost to diffraction anyway.... and will showcase even the smallest specks on the sensor, that would be invisible in your images if more practical, larger apertures were used instead.