I didn't mention this earlier, but my article on Sudoku Generation was printed in the Spring edition of The Perl Review. The first page of the article is available in PDF And of course the whole thing is available to download for subscribers. For subscribers only, the actual code from my generator is posted on the TPR website (password required).
I haven't gotten my physical copy in the mail yet, though. I also haven't gotten any author email telling me I'm brilliant or that I missed something obvious. So that is half good news, half disappointing.
I've sort of stalled on my Sudoku Grader project... I did complete the Locked Candidate detector, and flesh out the outer framework of the Grader, but I haven't gotten much farther. I might pick it up again in a month or so. I'm trying to follow AudreyT's approach, and be productive in hobby-coding by optimizing for fun. The big downside of that is that when you hit a patch of boring refactoring, you tend to stall.
Update: When I got home, it had arrived. It looks pretty good, I think.