Does anyone know of a list I can use which prompts which places to deregister and register?
Also, how do I register my cars in the new canton and what is the likely cost?

You just have to contact the traffic office for the canton that youre moving to or from. When we moved from ZH I sent an email to the zurich one and they forwarded it to the right person in the other canton. Then they told me exactly what I had to do.

Dont forget that youll have to change the address on your driving licence (even if its a credit card format!)

You need to register within 14 days - which can be tricky as theyll want a copy of your new residence permit (complete with new address) thatll probably take a month to get to you....

Other than that, health insurance and house insurance need to be changed asap - but i think an email will do. The easiest way to find out what else you need to change is to get the post office to forward everything to your new address and as your post arrives, tell the people who sent it your new address!

You should re-register at the place where your permit has been issued. You will then get papers which you can take with your now-cancelled permit to the new permit office. I'm assuming that your permit allows you to change cantons.

Registering the cars in the new canton is also easy. Take the car registration form and a cover note from your insurance provider and walk in. They will give you new plates and you can usually drop the old ones off there too.

Cost for the new plates varies from canton to canton; I paid 40 francs I believe.

When your plates arrive back at the old vehicle licence office, you will get a refund on the road tax you've paid. Naturally, you'll get a bill from the new place too.

The post office redirect/move service has an option where they notify the sender where possible; this is quite useful.

Also don't forget to inform: Billag, your electric company (which might know already), insurances, etc.