I added a custom entry for wunderground.com with the following image URL: http://icons-ecast.wxug.com/i/wu/wuLogoNon.png
However, no matter how many times i reload the speed dial page, it never takes and keeps showing me the actual web page (http://www.wunderground.com/cgi-bin/findweather/getForecast?query=46544). Any ideas?