There are a number of good web sites for information on Mount St. Helens and the surrounding areas.  Listed below are a few of our favorites.

This online brochure covers Mount St. Helens and the surrounding areas. http://www.mountsthelens-awesome.com/

Mount St. Helens VolcanoCam: This is a static image of Mount St. Helens as seen from the Johnston Ridge Observatory.  It is automatically updated approximately every five minutes. http://www.fs.fed.us/gpnf/volcanocams/msh/index.shtml

This site, provided by The Pacific Northwest Seismograph Network, provides information on the current status of the Volcano with Advisories and Updates. http://www.pnsn.org/

Mount St. Helens is located in The Gifford Pinchot National Forest.  This site contains current information on the mountain and different activities of interest taking place within the national forest. http://www.fs.fed.us/gpnf/

There are a number of trails around Mount St. Helens.  All people must have a climbing permit to be above 4,800 feet elevation on Mount St. Helens. For specific information on trails which require permits and the current status, see:
http://www.fs.fed.us/gpnf/recreation/mount-st-helens/permit-system.shtml

For general information on trails (both permit and non permit) see: http://www.fs.fed.us/gpnf/04mshnvm/trails/index.shtml and 
http://www.trails.com/activity.asp?AreaID=10062

For spectacluar views that you just can't get from the ground, consider a Helicopter tour of Mount St. Helens.  http://www.mt-st-helens.com/Helicoptertour.html