Rather than repeat in detail what my wife Su has already written about this in her blog today, please read her post about what happened in Bangkok last night here:
Thailand political unrest, May 2010 - update #5
In brief, the Thai anti-government protests are now over, but at an enormous cost in terms of human casualties and property damage. Bangkok and many other parts of Thailand are now under a daily night-time curfew until further notice. What a terrible mess.