Link to an ebook that reviews HTML5. Looks like pretty easy reading and has some example code and other references.
Leaflet
“Leaflet is a modern open-source JavaScript library for mobile-friendly interactive maps. It is developed by Vladimir Agafonkin with a team of dedicated contributors. Weighing just about 31 KB of JS, it has all the features most developers ever need for online maps.”
http://leafletjs.com/index.html