great capacitor resources

I'm struggling to grok all that capacitors are and do. Here are a couple resources that I assume that I'll keep coming back to. Capacitor Concepts has a nice graph about types of capacitors, what they are used for, and related equations for the different types and uses. This site details the meanings of various capacitor markings - important for me because I have accumulated a bunch of capacitors and very few say helpful things like 10uF 50VDC; most of my capacitors say things like 0.1k or 103M.