Ok, so this is an update on meditation visa from the embassy of Myanmar in Bangkok.
Applied for a visa on Tuesday. About.general procedure, location, opening times etc. you can find info for example here: http://www.myanmarvisa.com/bangkok.htm
or here: http://http://www.lonelyplanet.com/thorntree/thread.jspa?threadID=2178162
There is no official info about meditation visa anywhere around at the embassy. What I did was:
Got a business visa application form from the copy shop. Filled it in.
Prepared all the other papers which I would have to have for a procedure in Kuala Lumpur (invitation letter from a monastry, endorsement letter from a monastry in country of residence, letter of undertakings, 2 pictures, passport copy).
When submitting the papers I was asked if I have been to Myanmar on meditation visa before. As I understood should it had been the case, they would have taken my passport straight away. But as it was my first time I was told that they have to contact my monastry and if they say that they really invited me, I will be called (I had thai nr. at that moment) and then I can bring my passport. All that should happen tomorrow/ after tomorrow.
Next day I went to one Wat for few days out of Bangkok. I kept my phone on, but nobody called me...So on Monday (6 days later) in the afternoon, when people come to pick up their visas I went to the embassy again to find out what's going on. When asked at the business visa counter about my visa I was told that I have to talk to the chief officer, wait for half an hour. In about 20 min. the same guy called me, asked some questions ( like what was my religion, how long am I meditating, when I am going and how long for), took my passport and in another 15 min. I was called again, paid 1440 bhatt and got back my passport with 3 month visa
So it is not as straight forward as in KL, but it is possible, if you are in Bangkok, then I would try first to get the visa here and only if unsuccessful, go to KL.