As Google Video continues to scale back the features and options available, in exchange for YouTube, Google recently dropped the "download" button.
The download button, which can be seen here, was available on some Google Video hosted files. Now, it seems to be gone from all videos hosted on the Google Video platform.
Nelson from Google confirmed the change in a Google Web Search Help thread. He said:
We had discontinued the option of downloading videos, but during some internal house-cleaning, we removed it entirely.
Forum discussion at Google Web Search Help.
