noob casts 1-4 are really good (but resolution is crap): http://www.twitch.tv/gowerly/videos
especially the one, where he explains the different symbols...
this is a nice text for medium players: http://forums.gaspowered.com/viewtopic.php?f=2&t=52617
here a list with tutorials i have collected (some you already might know):
https://www.youtube.com/watch?v=v51Wv1ieLyg
https://www.youtube.com/watch?v=s6-suANPGs4
https://www.youtube.com/watch?v=rSREp7_0kdw
https://www.youtube.com/watch?v=7MEkpBBClGg
https://www.youtube.com/watch?v=PY4pXfw6n8s
https://www.youtube.com/watch?v=XziKuKuH5KY
https://www.youtube.com/watch?v=0HTtp1FErz4
https://www.youtube.com/watch?v=nJM8OZYllq4
https://www.youtube.com/watch?v=ahSDG_YcKnE
https://www.youtube.com/watch?v=F_sYnpyFpgs
https://www.youtube.com/watch?v=JDAh47OZ9Es
https://www.youtube.com/watch?v=NOxOWthebEw
https://www.youtube.com/watch?v=MCrWm1LRBEw
https://www.youtube.com/watch?v=2IhjuFY8t3w
here are more setons tutorials:
https://www.youtube.com/watch?v=jtwTaBkJJJ8
https://www.youtube.com/watch?v=pNxTEfcGmpA
https://www.youtube.com/watch?v=_gxnEqorJ94
https://www.youtube.com/watch?v=5FlI435cE3Y