Here is what I use for my Digital Photography / Imaging students...

Digital Photography wiki
http://digitalartstechacademy.wikispaces.com/Digital+Photo+Assignments
http://data-di.wikispaces.com/10+Online+Tutorials

As well as some video-based items:
http://www.photoshopusertv.com/category/photoshop-user-tv-episodes/

http://revision3.com/pixelperfect/

http://psd.tutsplus.com/category/videos/

http://www.adobe.com/designcenter/video_workshop/


http://movielibrary.lynda.com/html/modPage.asp?ID=131
http://www.photoshopcafe.com/
http://www.photoshopsupport.com/photoshop-blog/index.html
http://www.pslover.com/click/7531
http://www.turbophoto.com/Photoshop-Tricks/Photoshop-Tricks-Clouds.htm
http://www.radiantvista.com/video_tutorials/
http://www.pegaweb.com/tutorials/web-design-and-adobe-photoshop-tutorials.htm
http://www.sketchpad.net/photoshp.htm
http://www.planetphotoshop.com/tutorials_effects.html
http://www.absolutecross.com/tutorials/photoshop/
http://www.radiantvista.com/video_tutorials/
http://www.davrodigital.co.uk/tut1.htm
http://www.graphic-design.com/Photoshop/
http://www.insidegraphics.com/text_effects/default.asp
http://www.eyesondesign.net/pshop/patterns/pattern1.htm
http://www.dpreview.com/forums/
http://www.oman3d.com/tutorials/photoshop/index_video.php
http://psdtuts.com/page/4/
http://www.dreamstime.com/illustrations_cid172_pg2
http://www.photoshopessentials.com/photo-effects/blend-photos/page-2.php
https://www.expedia.com/pub/agent.dll?qscr=expr
http://www.good-tutorials.com/tutorials/photoshop/web-graphics
http://www.carlosaleman.com/tutorial.html
http://www.photoshop-pack.com/details/Diagonal_Lines/11402
http://www.layersmagazine.com/category/tutorials/photoshop

Check out the podcasts and online tutorials I created for my Digital
Tools class, which contains a complete college class in Photoshop,
Illustrator, InDesign and more. I am currently updating the lessons
from CS3 to CS4 for the fall semester, but it should still be a help.

http://profsaint.com

Then click on the link for "Digital Tools for the Design Profession"