[Nanook]

Well in line with the "overstay" subject, I think I read somewhere on this forum that with the standard 30-day visa stamp you must be careful too. However, I tries Thaisvisa.com, but it is not clear to me. Here is my Thai trip history:
November 2006: stayed 6 days.
March 2007 : stayed 8 days.
May 2007 : stayed 8 days.

So in total 22 days.

Now I fly in on September 19 and want to stay for about 18 days. Can I just take the regular 30 day stamp they give you at the airport? Or should I apply for a visa before?

Thanks for your advice!