How to Design a portfolio, take a look: http://skyje.com/2011/03/quality-portfolio/. Out of the ones mentioned, which is your favorite and why.

What other sites can you recommend?

To see how companies use learning tutorials for training employees, see http://www.sapient.com/en-us/careers/training-and-development.html. You will see the titles of the tutorials, but no actual elearning modules. Those you see after you are hired!

Poll: What applications do you use primarily for Web design (for the visual part)?

Illustrator CS5 for Web Design Interface.

Yes, you read correctly. To find out how, read http://www.smashingmagazine.com/2011/01/17/productive-web-design-with-adobe-illustrator/. Thorough explanations and even downloads to get you started. No time like the present. Take a look now. Have you used Illustrator as your interface design tool yet?