REALLY cool website that shows you the place, manner, voicing etc. of any sound you chose with great animated anatomy pictures. This is a great resource for teaching those hard to see sounds like /k/ and /r/ as well as all the others. Also an interactive articulatory anatomy diagram. Check it out!!!!!
By far the BEST message board for speech on the Internet. Loads of traffic, tons of materials shared on the site that can be searched by Google, and people that will answer any question or give help with anything you post! It is a great resource!