The Swine flu has started to spread from human to human and in Thailand we so far have more then 50 cases.
It is not an alarming number and many other countries have more people with swine flue then Thailand. The problem is if you coming here with any type of flue symptom its unlikely they will let you in the country.
You probably have to spend a few days in the hospital curtsy of the Thai government and they do not have a beach or beer bar only cute nurses, hopefully.
So if you have flu like symptoms and want to come to Thailand go to your local doctor and get a certificate that this is not swine flue and show that to the airport staff on arrival.