Are Bitcoin in Thailand illegal?
https://bitcoin.co.th/trading-suspended-due-to-bank-of-thailand-advisement/

The short version of that article direct from Bitcoin is...

Do not send/receive/mine Bitcoin if you are in Thailand.  Do not buy/sell to any one where the receiving/sending wallet is in Thailand and/or the product (virtual or real) is sent via Thailand.  Currency laws have not caught up to virtual currencies and how ( if it can be done ) it can be taxed. Bitcoin, as a group, has decided it is in the best interest of the virtual currency to try and stop trades to/from that country and ask people there to not mine ( it is really hard to stop someone from logging in to a pool and mining if they want to )

Bitcoin Co. Ltd. has currency exchange applications currently pending review with the Bank of Thailand