The following websites all contain great information on mixed climbing conditions and general mixed beta.
Banff National Park Avalanche Forecast: hazard report is posted daily during the winter months.
Canmore Weather: Environment canada's weather forecast for Canmore, Alberta.
www.live-the-vision.com : The message board often contains posts about ice and mixed conditions in the Canadian Rockies.
www.rockies-ice.com: Sean Easton's commercial website that also offers ice conditions and new route information.
www.gravsports.com : Will Gadd's website with a frequently updated conditions page for the Canadian Rockies.
www.climbingcentral.com: Ice conditions and new route information for for the mid-west and Lake Superior region.
www.neice.com : Conditions for North East ice and mixed climbing, including New England and Quebec.
North American ice climbing festivals
www.mountainx.ca: Louis-Julien Roy's site contains some condition information.
www.mixeddreams.com : Ryan Nelson's website which includes some mixed climbing information.
www.mountainsoft.net/users/jd/ : JD LeBlanc's site containing mixed route info and rants.
www3.telus.net/s2huisman/cover.html : Shawn and Shelly Huisman's homepage with some relevant winter climbing information.