I'm using MASM.
http://www.masm32.com/
For debugging I use OllyDbg.
http://www.ollydbg.de/
Here is a nice overview list of assemblers : http://en.wikipedia.org/wiki/Comparison_of_assemblers
Beware of he who would deny you access to information, for in his heart he dreams himself your master.
Commisssioner Pravin Lal
"U.N. Declaration of Rights"