You could also try these guys, they are local and good friends of mine - the chairman is a very well known local Thai hotelier who lost several resorts in the Tsunami.
I spent the last 3 weeks before Xmas helping them distribute collection boxes to just under 400 hotels in Phuket/Khao Lak/BKK/Samui/Krabi/Chiang Mai and more. You may well have seen the collection bucket that has been left in MTB for the past few days. Nicke very kindly offered to keep the bucket and attempt to fill it up even after we were supposed to only be leaving it there until the end of Boxing Day night.
The funds this year are going to several well established charities located in Phuket/Khao Lak/Phi Phi and Trang.
It would be a very good idea to help locally in Phuket, but after visiting Khao Lak recently it did make me realise how badly they were hit, and how important it was not to completely focus on Phuket, who in the scheme of things were not that badly affected.
The website is
www.tsunamiday.org They have a donate online (through Paypal) setup and the benefit is that you will be able to see the actual people your money went to as there will be follow up stories and images from the locations that recieved the donations.
From reading the other thread quoted above it seems alot of the concerns were about actually setting up the trust in the first place. Well this is already setup and running with a Thai Chairman, so in theory the main problems are out of the way.
If anyone is interested in taking something further, please let me know and I can arrange something with the trustees.
Also, if you do have some spare pennies knocking around please do visit the website and donate what you can. It will be much appreciated, especially by the people it will ultimately help.
www.tsunamiday.org