You can always check out the Blender documentation. That's usually the first place I go if I want to look into something.
Here's an overview: http://wiki.blender.org/index.php/Doc:2 ... der/Cycles
It looks like someone put together a list of tutorials as well: http://wiki.blender.org/index.php/Doc:2 ... /Tutorials
That said though, almost all newer tutorials out there will use Cycles when they render or make materials. Getting a hang of Cycles material nodes will probably be your biggest hurdle, assuming you are used to the Blender Internal way of making materials.