What is the process for transferring visa stamps to a new passport in Thailand?

Okay the process is handled different depending on if you have a VISA (a sticker from a thai consulate) <- where you bounce out and back every 90 days OR whether you have an "extension of stay" (from the immigration office) <- where you do 90 day reporting.

A visa sticker can't be moved from one passport to another, so you just carry BOTH passports until you leave the country.

An extension of stay can be transferred to a new passport and while this is the list of requirements for doing the transfer in bangkok, here's basically what you need to do it.

Post on a Chiang Mai f/b group and you'll get answers from people up there who have done it