As far as I know, http://www.danica.com/flytier/index.html is still the URL for Hans' site. However, as you pointed out, it doesn't seem to be working at this time (I believe it was working a few days ago). In addition to his site, Hans posts quite a few video on YouTube. You can find his YouTube channel at http://www.youtube.com/user/hansweilenmann. In addition, some of his YouTube videos are getting cross-posted at http://www.flytyingbug.com/forum/.