Joel, over at So You Want to Teach, has put together a list of 50 Teaching Tips. Some are pretty universal -- "Choose your battles," "Establish a constant routine" -- and some are much more specific -- "You need to teach fundamental technique before you can presume to teach musicality." But all of them are worth a perusal and possibly a usal.
Also, I'm a bit late on this one, but the newest Carnival of Education is up (and has been since Wednesday) at Bellringers! I forgot to submit anything for inclusion, but there are still lots of great articles there, worth your perusal. (and possibly usal)