Thanks!
Well, sorry for the late reply - my favourite tutorials are the old school ones, although there are many great ones on DA. The ones I used back in the day (I'm pretty sure most are still around) are Julie Dillon's cel-shading tutorial to get used to Photoshop's tools, Enayla/Linda Bergkvist's great tutorials (www.furiae.com), Katherine Dinger's tuts (www.pocketmole.com).
If I think of any more I'll add them, but those were my favourite off the top of my head!