editor not picking up changes to editor-style.css

I have been editing the new twentyten theme and now I am editing editor-style.css to match. However, no matter what changes I make, they are not implemented!

If I look at firebug, it is pointing to the editor stylesheet in my theme, with ?ver=327-1235 at the end and all the styles are NOT what I put in that file!

This is all very confusing! I thought the whole point was to make it easy to style the editor! Why isn’t it picking up my stylesheet?