I wasn't sure that I would have the patience to actually complete the project, but with some self discipline and stamina, I finished Barbara Walker's Learn To Knit Afghan. I started with Square #1 in March 2009 and finished the single-crochet outer border on 2 November 2009. I used Cascade 220 and 4.25 mm needles. Finished size is approximately 60" x 74".
True to its name, I learned a great deal about knitting. Every square (63 in total) is a different pattern and incorporates most (?) major knitting techniques. (No Fair Isle or Intarsia techniques.) My favorite square was one of the twist-stitch patterns, although getting a good left twist was a bit of a challenge until I found a technique not mentioned in the book. My least favorite square was the "sea-foam" pattern. I didn't care for knitting it and I'm indifferent (at best) to the pattern.
Overall, the project has certainly given me the confidence to try just about anything. It's amazing what one can create by combining a knit stitch and purl stitch.