YourThaiPlanet.com

UPDATE - Effective from December 2008, tourists who have not obtained a visa prior to their visit to Thailand and arrive via a land border checkpoint (Cambodia, Laos, Burma etc.), will be granted only a 15-days permission of stay. In practice, this means: No longer 30-day entry stamps when doing one-day "visa runs" to the Cambodian border!

Foreigners arriving via international airports are not affected by this regulation; they will still obtain a 30-days entry stamp.

Effective from June 1, 2009, foreign visitors, who have entered Thailand four consecutive times on 15-day entry stamps (via land border checkpoints) will not be allowed to leave the country and re-enter Thailand by land.

The only option is to exit Thailand and re-enter via an international airport, in which case a further 30-day extension of stay in the Kingdom will be granted.

If you plan to further extend your holidays in Thailand by travelling on 60-day tourist visas, please note that in September 2009, Thai embassies and consulates have announced a new crackdown on back-to-back tourist visa applications.

Tourist visa applicants will face stricter "screening measures" to make sure that they are genuine tourists and use their visas not as a way to work illegally in Thailand. Applicants with "too many" back-to-back tourist visa stamps may have a new application refused. Thailand Visa News

In August 2011, Thai embassies and consulates abroad have also been instructed to be "stricter with requirements when applicants are applying for 60-day tourist visas for Thailand."

From now on, Thai embassies will also require a "confirmed airline ticket with flight numbers and date of entry/exit," when applying for 60-day tourist visas, "plus confirmed hotel reservations with name and dates of checking in/out." If one of the required documents is missing, an explanation letter must be provided. The new requirements are reportedly in effect immediately, i.e. since the end of August 2011. ThaiVisa.com