Below is an extensive list of retouching and post production videos and tutorials which I highly recommend.
CONCEPTS
**New Article** -
http://www.diyphotography.net/the-power-of-color-and-color-harmonies-in-composition/
Thoughts on Contrast by Guy Gowan
http://www.guygowan.com/focus/video.php?&userid=169
Thoughts on Colour by Guy Gowan
http://www.guygowan.com/focus/video.php?&userid=167
Thoughts on Sharpening by Guy Gowan
http://www.guygowan.com/focus/video.php?&userid=168
Thoughts on Recovery by Guy Gowan
http://www.guygowan.com/focus/video.php?&userid=2164
Thoughts on HDR by Guy Gowan
http://www.guygowan.com/focus/video.php?&userid=2157
Thoughts on Black and White by Guy Gowan
http://www.guygowan.com/focus/video.php?&userid=2138
Videos
Editorial Retouch from Start to Finish Series Episodes 1-13 by Krunoslav Stifter
The Differences between brightness and Luminosity with Conny Wallstrom
[embed width="123" height="456"]https://www.youtube.com/watch?v=N1Mq3O0ahTU[/embed]
Adding shine or Pop the Highlights with Gry Garness
[embed width="123" height="456"]https://www.youtube.com/watch?v=WUtd2wf-ca8[/embed]
An Overview of Colour Grading with Natalia Taffarel
[embed width="123" height="456"]https://www.youtube.com/watch?v=25QarOEIPkY[/embed]
An in-depth analysis of Colour Palettes and Retouching with Natalia Taffarel
[embed width="123" height="456"]https://www.youtube.com/watch?v=gzchCaOJ67g[/embed]
Full Edit with Natalia Taffarel
[embed width="123" height="456"]https://vimeo.com/68360962[/embed]
Retouching Hair - Clone in Darken Mode by Natalia Taffarel
[embed]https://vimeo.com/25667413[/embed]
Opacity vs Fill by Natalia Taffarel
[embed]https://vimeo.com/13868502[/embed]
How to use Supporting Layers for Editing images with Jonas W
[embed]https://www.youtube.com/watch?v=oBK83DZpdEQ[/embed]
Glamour Retouching Part 1 With Carrie Beene
[embed]https://www.youtube.com/watch?v=42MUfe1llO8[/embed]
Glamour Retouching Part 2 With Carrie Beene
[embed]https://www.youtube.com/watch?v=MAVzBLyoqDY[/embed]
Capture One Pro 8 Webinar | Retouching workflow with Pratik Naik
[embed]https://www.youtube.com/watch?v=8PCK8rXgj9I[/embed]
Dodge and Burn Technique by Sean Armenta
[embed]https://vimeo.com/14381588[/embed]