A "Very Good" tutorial for Source texture exporting.

[TheMegolith]

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A very good color coded tutorial on texture exporting, includes batch file code examples to automate the file conversion and file export process.

http://wf2dev.org/hl2_tutorials/Preparing_a_new_texture_for_HL2_source/index.htm

Wana see some screens of the results of this tutorial checkout;
http://screenshots.wf2dev.org
The concepts section has some nice backgrounds to check out.

Comments, Questions, Corrections or Additions are welcome. Screen shots example of what you should be seeing will be added soon.
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[FictiousWill]

Plugin for photoshop, cuts out all the work apart from scripting:

http://nemesis.thewavelength.net/index.php?p=39