I think I was able to go clear through:

http://minnow.cc.gatech.edu/squeak/3336

And I have FooPlugin.dll and I've placed that into the same directory as 
Squeak.exe. However, it doesn't appear to be running my primitive. I put 
a Transcript#show in the compiled plugin and then changed it in my code 
so I could see which one it's running. It appears to be running the 
interpreted code.

Is putting FooPlugin.dll in the same directory as squeak.exe sufficient 
on Windows (I notice the tutorial is for Mac)? I also tried putting it 
in the same directory as the image, and that didn't work either.

Also, is there a requirement for the name of the dll? Does it have to 
match the moduleName?

Thanks,

-joel