I just thought it might be of interest that my latest video training title "Photoshop Pencil and Wash" is being released tomorrow, Monday 28th March.
It's worth noting that the technique I demonstrate in this title is not dependent on the Mixer Brush Tool, so it's fine for versions of Photoshop prior to CS5.
there's over three hours of video instruction here, showing you how to create super-effective pencil sketches direct from a photographic source image, so you don't have to be able to draw to produce superb results!
I thought I'd post this here as, although I don't get much time to post in the forums, I'm continually impressed by the standard of work displayed in these forums.
Here's a trailer for this title: http://www.timshelbourne.net/pencil/pencil1.html
Kind regards to all,