Admittedly, not the prettiest website but chock full of some useful information. Check out BikeTouringTips.com (pretty easy URL to remember right?). Just a quick cursory glance led me to some great pages such as a link to ALL the national forest maps in California! How about a list of 17 great rides around San Luis Obispo, one of my favorite places to ride.
You can do a text search by topic or search for tips by geographical location. Definitely a great resource.