I have a dump file named Sins-Entrenchment beta 1.1-2008-12-22-01-08-56-3632-3640.dmp, located in my ~\AppData\Local\Temp\Sins Dump folder.
I'd just finished a game and selected "Main Menu", and the game locked, I alt tabbed and saw the .dmp file created, but I had to manually kill the Sins proccess to get it to exit.
If there's a formal way to submit bug reports, I missed it, and would appreciate being pointed in the right direction.
Thanks.