For those of you that still do not believe that Google Mail is real, there are screenshots of the service at miscoranda. Miscoranda also has a fairly good explanation of the feature set to go along with the screenshots. I did see a "Spam" link on the third screenshot, but the post on Miscoranda does not address the spam blocking features.
More screenshots from Google employee Kevin Fox.
One screenshot from Jason Shellen (it's at the bottom of the post).