Lawyers can be such a pain. Because of people worrying about name and trademark confusion, Attilla Danko's fabulously useful weather-forecasting tool has officially changed names to Clear Sky Chart. Please make a note of it. You can read the gory details of Danko's decision on his FAQ page.
While it's a shame that he had to be bothered by such machinations, users are barely affected. Because Danko never used "clock" as part of the URL, all the thousands of links in browser bookmarks and on home pages of astronomy clubs will still work.